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Financial Instruments - Gain/(Loss) Reclassified from Other Comprehensive Income into Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	$ 26,436	$ 24,777	$ 14,222
Income tax related to amounts reclassified into consolidated statement of income	(9,965)	(8,998)	(5,230)
Total	16,471	15,779	8,992
Revenue [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	11,231	7,952	7,941
Foreign exchange gain/(loss), net [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	15,766	16,896	$ 6,281
Finance expense [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	$ (561)	$ (71)

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The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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