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Income Taxes - Income Taxes Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income tax relating to components of other comprehensive income [abstract]
Current taxes	$ 0	$ 0	$ 0
Unrealized gain/(loss) on cash flow hedging derivatives	1,877	(9,409)	6,921
Pension liability	(939)
Total income tax recognized directly in other comprehensive income	$ 938	$ (9,409)	$ 6,921

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

Income tax relating to current tax of other comprehensive income.

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X

- Definition

Income tax relating to (Increase)/Decrease in pension liability recognized in other comprehensive income.

+ References

No definition available.

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