Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Derivative Financial Instruments - Effect of foreign currency exchange and interest rate swap contracts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Designated As Hedging Instrument \| Cash flow hedges. \| Revenue
Derivative Financial Instruments
Amount of Gain or (Loss) Reclassified from AOCI into Income (loss)		$ (807)	$ (18)	$ (1,163)
Designated As Hedging Instrument \| Cash flow hedges. \| Costs of revenue
Derivative Financial Instruments
Amount of Gain or (Loss) Reclassified from AOCI into Income (loss)	$ 1,119	(659)	1,524	(341)
Designated As Hedging Instrument \| Cash flow hedges. \| Operating Expense
Derivative Financial Instruments
Amount of Gain or (Loss) Reclassified from AOCI into Income (loss)	482	(343)	682	(173)
Designated As Hedging Instrument \| Cash flow hedges. \| Interest expenses
Derivative Financial Instruments
Amount of Gain or (Loss) Reclassified from AOCI into Income (loss)	101	236	309	443
Designated As Hedging Instrument \| Cash flow hedges. \| Foreign Exchange Contract
Derivative Financial Instruments
Amount of Gain or (Loss) Recognized in AOCI on Derivatives	673	(6,309)	3,306	(11,601)
Designated As Hedging Instrument \| Cash flow hedges. \| Interest rate swaps
Derivative Financial Instruments
Amount of Gain or (Loss) Recognized in AOCI on Derivatives	(791)	193	(3,836)	466
Nondesignated \| Foreign Exchange Contract \| Revenue
Derivative Financial Instruments
Amount of Gain or (Loss) Recognized in Income (loss) on Derivatives	889	287	1,244	1,106
Nondesignated \| Foreign Exchange Contract \| Costs of revenue
Derivative Financial Instruments
Amount of Gain or (Loss) Recognized in Income (loss) on Derivatives	(499)	(220)	(725)	(753)
Nondesignated \| Foreign Exchange Contract \| Selling General And Administrative Expenses
Derivative Financial Instruments
Amount of Gain or (Loss) Recognized in Income (loss) on Derivatives	$ (66)	$ (19)	$ (86)	$ (19)