1.1 Basis of preparation of financial statements
 
 The financial statements of the Company have been prepared in
 accordance with generally accepted accounting principles in India
 (Indian GAAP). The Company has prepared these financial statements to
 comply in all material respects with the accounting standards notified
 under the Companies (Accounting Standards) Rules, 2006, (as amended)
 and the relevant provisions of the Companies Act, 1956. The financial
 statements have been prepared on an accrual basis and under the
 historical cost convention.
 
 1.2 Presentation and disclosure of financial statements
 
 During the year ended 31st March, 2012, the revised Schedule VI
 notified under the Companies Act 1956, has become applicable to the
 Company, for preparation and presentation of its financial statements.
 The adoption of revised Schedule VI does not impact recognition and
 measurement principles followed for preparation of financial
 statements. However, it has significant impact on presentation and
 disclosures made in the financial statements. The Company has also
 reclassified the previous year figures in accordance with the
 requirements applicable in the current year.
 
 1.3 Use of estimates
 
 The preparation of financial statements in conformity with Indian GAAP
 requires the management to make judgments'' estimates and assumptions
 that affect the reported amounts of revenues, expenses, assets and
 liabilities and the disclosure of contingent liabilities, at the end of
 the reporting period. Although these estimates are based on the
 management''s best knowledge of current events and actions,
 uncertainty about these assumptions and estimates could result in the
 outcomes requiring a material adjustment to the carrying amounts of
 assets or liabilities in future periods.
 
 1.4 Revenue recognition
 
 a) Contract revenue
 
 Revenue from fixed price contracts is recognized when the outcome of
 the contract can be estimated reliably by reference to the percentage
 of completion of the contract on the Balance sheet date. Percentage of
 completion is determined as a proportion of costs incurred-to-date to
 the total estimated contract costs. In respect of process technology
 and design and engineering contracts percentage of completion is
 measured with reference to the milestones specified in the contract,
 which in the view of the management reflects the work performed and to
 the extent it is reasonably certain of recovery.
 
 Contract costs include costs that relate directly to the specific
 contract and costs that are attributable to contract activity and
 allocable to the contract. Costs that cannot be attributed to contract
 activity are expensed when incurred.
 
 When the final outcome of a contract cannot be reliably estimated,
 contract revenue is recognized only to the extent of costs incurred
 that are expected to be recoverable.  Provision for expected loss is
 recognized immediately when it is probable that the total estimated
 contract costs will exceed total contract revenue.
 
 Variations, claims and incentives are recognized as a part of contract
 revenue to the extent it is probable that they will result in revenue
 and are capable of being reliably measured.
 
 Determination of revenues under the percentage of completion method
 necessarily involves making estimates by the Company, some of which are
 of a technical nature, concerning, where relevant, the percentage of
 completion, costs to completion, the expected revenues from the
 project/activity and the foreseeable losses to completion.
 
 Execution of contracts necessarily extends beyond accounting periods.
 Revision in costs and revenues estimated during the course of the
 contract are reflected in the accounting period in which the facts
 requiring the revision become known.
 
 b) Service revenue
 
 Revenue from services is recognized as the related services are
 performed.
 
 c) Product sales
 
 Revenue from sale of goods is recognized on transfer of significant
 risks and rewards of ownership when goods are dispatched and the title
 passes to the customers, net of discounts and rebates granted. Sales
 are recorded exclusive of sales tax.
 
 d) Interest and dividend income
 
 Interest on deployment of surplus funds is recognized using the time
 proportion method based on the underlying interest rates.
 
 Dividend income is recognized when the right to receive payment is
 established.
 
 e) Export benefits
 
 Export benefits in the form of duty draw back/ DEPB claims etc. are
 recognized on receipt basis.
 
 1.5 Tangible assets
 
 Tangible assets are stated at historical cost, net of accumulated
 depreciation and accumulated impairment losses, if any. The cost
 comprises purchase price, borrowing costs if capitalization criteria
 are met and directly attributable cost of bringing the asset to its
 working condition for the intended use. Any trade discounts and rebates
 are deducted in arriving at the purchase price.
 
 Subsequent expenditure related to an item of tangible asset is added to
 its book value only if it increases the future benefits from the
 existing asset beyond its previously assessed standard of performance.
 All other expenses on existing tangible assets, including day-to-day
 repair and maintenance expenditure and cost of replacing parts, are
 charged to the statement of profit and loss for the period during which
 such expenses are incurred.
 
 Gains or losses arising from de-recognition of tangible assets are
 measured as the difference between the net disposal proceeds and the
 carrying amount of the asset and are recognized in the statement of
 profit and loss when the asset is derecognized.
 
 1.6 Depreciation:
 
 Depreciation on tangible assets is calculated on a straight-line basis
 using the rates arrived at based on the useful lives estimated by the
 management, or those prescribed under the Schedule XIV to the Companies
 Act, 1956, whichever is higher.
 
 Assets costing individually Rs 5,000 or less are depreciated at the rate
 of 100%.
 
 Building and other constructions on leasehold land are depreciated over
 the lease term or the useful life, whichever is shorter.
 
 1.7 Intangible assets and amortization
 
 Intangible assets are recognized when the asset is identifiable, is
 within the control of the Company, it is probable that the future
 economic benefits that are attributable to the asset will flow to the
 Company and cost of the asset can be reliably measured.
 
 Acquired intangible assets consisting of technical know how, brand and
 software, are recorded at acquisition cost and amortized on
 straight-line basis based on the following useful lives, which in
 management''s estimate represents the period during which economic
 benefits will be derived from their use:
 
 1.8 Impairment of assets
 
 The carrying amounts of the Company''s assets including intangible
 assets are reviewed at each Balance sheet date to determine whether
 there is any indication of impairment. If any such indications exist,
 the assets recoverable amount is estimated, as the higher of the net
 selling price and the value in use. An impairment loss is recognized
 whenever the carrying amount of an asset or its cash generating unit
 exceeds its recoverable amount. If at the Balance sheet date, there is
 an indication that a previously assessed impairment loss no longer
 exists, the recoverable amount is reassessed and the asset is
 reinstated at the recoverable amount subject to a maximum of
 depreciable historical cost.
 
 1.9 Investments
 
 Investments, which are readily realizable and intended to be held for
 not more than one year from the date on which such investments are
 made, are classified as current investments. All other investments are
 classified as long-term investments.
 
 On initial recognition, all investments are measured at cost. The cost
 comprises purchase price and directly attributable acquisition charges
 such as brokerage, fees and duties.
 
 Current investments are carried in the financial statements at lower of
 cost and fair value determined on an individual investment basis.
 Long-term investments are carried at cost.  However, provision for
 diminution in value is made to recognize a decline other than temporary
 in the value of the investments.
 
 On disposal of an investment, the difference between its carrying
 amount and net disposal proceeds is charged or credited to the
 statement of profit and loss.
 
 1.10 Inventories
 
 Raw materials, components, stores and spares are valued at lower of
 cost and net realizable value. However, materials and other items held
 for use in the production of inventories are not written down below
 cost if the finished products in which they will be incorporated are
 expected to be sold at or above cost. Cost of raw materials, components
 and stores and spares is determined on a weighted average basis.
 
 Work-in-progress and finished goods are valued at lower of cost and net
 realizable value. Cost includes direct materials and lab our and a
 proportion of manufacturing overheads based on normal operating
 capacity. Cost of finished goods includes excise duty and is determined
 on a weighted average basis.
 
 Net realizable value is the estimated selling price in the ordinary
 course of business, less estimated costs of completion and estimated
 costs necessary to make the sale.
 
 1.11 Foreign currency transactions
 
 Initial recognition
 
 Foreign currency transactions are recorded in the reporting currency,
 by applying to the foreign currency amount the exchange rate between
 the reporting currency and the foreign currency at the date of the
 transaction.
 
 Conversion
 
 Foreign currency monetary items are translated using the exchange rate
 prevailing at the reporting date.
 
 Non-monetary items, which are measured in terms of historical cost
 denominated in a foreign currency, are reported using the exchange rate
 at the date of the transaction.
 
 Forward Contracts
 
 The premium or discount arising at the inception of forward exchange
 contract is a mortised and recognized as an expense/income over the life
 of the contract. Exchange differences on such contracts, except the
 contracts which are long-term foreign currency monetary items, are
 recognized in the statement of profit and loss in the period in which
 the exchange rates change.  Any profit or loss arising on cancellation
 or renewal of such forward exchange contract is also recognized as
 income or as expense for the period.
 
 1.12 Leases
 
 Lease payment under an operating lease is recognized as an expense in
 the Statement of Profit and Loss on a straight line basis over the
 lease term.
 
 1.13 Employee benefits
 
 a) Short-term employee benefits
 
 Employee benefits payable wholly within twelve months of rendering the
 service are classified as short-term employee benefits and are
 recognized in the period in which the employee renders the related
 service.
 
 b) Post employment benefits (defined benefit plans)
 
 The employees'' gratuity scheme is a defined benefit plan. The present
 value of the obligation under such defined benefit plan is determined
 at each Balance sheet date based on an actuarial valuation using the
 projected unit credit method. Actuarial gains and losses are recognized
 immediately in the Statement of Profit and Loss.
 
 c) Post employment benefits (defined contribution plans)
 
 Contributions to the provident fund and superannuation fund, which are
 defined contribution schemes, are recognized as an expense in the
 Statement of Profit and Loss in the period in which the contribution is
 due.
 
 d) Long-term employee benefits
 
 Long-term employee benefits comprise of compensated absences and other
 employee incentives. These are measured based on an actuarial valuation
 carried out by an independent actuary at each Balance sheet date unless
 they are insignificant. Actuarial gains and losses and past service
 costs are recognized immediately in the Statement of Profit and Loss.
 
 1.14 Provisions and Contingencies
 
 Provision is recognized in the Balance sheet when, the Company has a
 present obligation as a result of a past event; it is probable that an
 outflow of economic benefits will be required to settle the obligation;
 and a reliable estimate of the amount of the obligation can be made. A
 disclosure by way of a contingent liability is made when there is a
 possible obligation or a present obligation that may, but probably will
 not, require an outflow of resources. Where there is a possible
 obligation or a present obligation that the likelihood of outflow of
 resources is remote, no provision or disclosure is made.
 
 1.15 Income taxes
 
 Tax expense comprises current and deferred tax. Current income-tax is
 measured at the amount expected to be paid to the tax authorities in
 accordance with the Income-tax Act, 1961
 
 Deferred income taxes reflect the impact of timing differences between
 taxable income and accounting income originating during the current
 year and reversal of timing differences for the earlier years. Deferred
 tax is measured using the tax rates and the tax laws enacted or
 substantively enacted at the reporting date. Deferred income tax
 relating to items recognised directly in equity is recognised in equity
 and not in the statement of profit and loss.
 
 Deferred tax liabilities are recognized for all taxable timing
 differences. Deferred tax assets are recognised for deductible timing
 differences only to the extent that there is reasonable certainty that
 sufficient future taxable income will be available against which such
 deferred tax assets can be realised. In situations where the Company
 has unabsorbed depreciation or carry forward tax losses, all deferred
 tax assets are recognised only if there is virtual certainty supported
 by convincing evidence that they can be realised against future taxable
 profits.
 
 In the situations where the Company is entitled to a tax holiday under
 the Income-tax Act, 1961 enacted in India or tax laws prevailing in the
 respective tax jurisdictions where it operates, no deferred tax (asset
 or liability) is recognized in respect of timing differences which
 reverse during the tax holiday period, to the extent the Company''s
 gross total income is subject to the deduction during the tax holiday
 period. Deferred tax in respect of timing differences which reverse
 after the tax holiday period is recognised in the year in which the
 timing differences originate. However, the company restricts
 recognition of deferred tax assets to the extent that it has become
 reasonably certain or virtually certain, as the case may be, that
 sufficient future taxable income will be available against which such
 deferred tax assets can be realized. For recognition of deferred taxes,
 the timing differences which originate first are considered to reverse
 first.
 
 At each reporting date, the Company re-assesses unrecognised deferred
 tax assets. It recognises unrecognized deferred tax asset to the extent
 that it has become reasonably certain or virtually certain, as the case
 may be, that sufficient future taxable income will be available against
 which such deferred tax assets can be realized.
 
 The carrying amount of deferred tax assets are reviewed at each
 reporting date. The Company writes-down the carrying amount of deferred
 tax asset to the extent that it is no longer reasonably certain or
 virtually certain, as the case may be, that sufficient future taxable
 income will be available against which deferred tax asset can be
 realized. Any such write-down is reversed to the extent that it becomes
 reasonably certain or virtually certain, as the case may be, that
 sufficient future taxable income will be available.
 
 Deferred tax assets and deferred tax liabilities are offset, if a
 legally enforceable right exists to set-off current tax assets against
 current tax liabilities and the deferred tax assets and deferred taxes
 relate to the same taxable entity and the same taxation authority.
 
 Minimum Alternate Tax (MAT) paid in a year is charged to the statement
 of profit and loss as current tax. The Company recognizes MAT credit
 available as an asset only to the extent that there is convincing
 evidence that the Company will pay normal income tax during the
 specified period, i.e., the period for which MAT credit is allowed to
 be carried forward. In the year in which the Company recognises MAT
 credit as an asset in accordance with the Guidance Note on Accounting
 for Credit Available in respect of Minimum Alternate Tax under the
 Income Tax Act, 1961, the said asset is created by way of credit to the
 statement of profit and loss and shown as MAT Credit Entitlement.
 The Company reviews the MAT credit entitlement asset at each
 reporting date and writes down the asset to the extent the Company does
 not have convincing evidence that it will pay normal tax during the
 specified period.
 
 1.16 Earnings per share
 
 Basic earnings per share are calculated by dividing the net profit or
 loss for the period attributable to equity shareholders by the weighted
 average number of equity shares outstanding during the period as
 reduced by number of shares bought back, if any. The weighted average
 number of equity shares outstanding during the period is adjusted for
 events such as bonus issue, bonus element in a rights issue, share
 split, and reverse share split (consolidation of shares) that have
 changed the number of equity shares outstanding, without a
 corresponding change in resources.
 
 For the purpose of calculating diluted earnings per share, the net
 profit or loss for the period attributable to equity shareholders and
 the weighted average number of shares outstanding during the period are
 adjusted for the effects of all dilutive potential equity shares.
 
 1.17 Cash and cash equivalents
 
 Cash and cash equivalents for the purposes of cash flow statement
 comprise cash at bank and in hand and short-term investments with an
 original maturity of three months or less.
 
 b) Terms/ Rights attached to equity shares:
 
 The Company has only one class of equity shares having a par value of Rs
 2 per share. Each holder of the equity shares is entitled to one vote
 per share. The Company declares and pays dividend in Indian rupees.
 The dividend proposed by the Board of Directors is subject to the
 approval of the shareholders in the ensuing Annual General Meeting.
 
 During the year ended 31st March, 2012, the amount of per share
 dividend recognised as distributed to equity shareholders was Rs 1.62
 (31st March, 2011 Rs 1.26).
 
 In the event of liquidation of the Company, the holders of equity
 shares will be entitled to receive remaining assets of the company
 after distributing all preferential amounts.
 
 c) Shares held by holding/ultimate holding company and/or their
 subsidiaries/associates: