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Derivative Instruments (Pretax effect of derivative instruments on the condensed consolidated statement of operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivatives Designated as Hedging Instruments \| Foreign Exchange Contract [Member] \| Cost of products sold
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	$ 303	$ (24)	$ (219)
Derivatives Designated as Hedging Instruments \| Currency Swap [Member] \| Cost of products sold
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	7,654
Derivatives Designated as Hedging Instruments \| Interest Rate Swap [Member] \| Cost of products sold
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	(3,185)	(1,275)	1,339
Derivatives Designated as Hedging Instruments \| Cross Currency Interest Rate Contract [Member] \| Cost of products sold
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives (Effective Portion)		18,242	(24,838)
Derivatives Not Designated as Hedging Instruments \| Foreign Exchange Contract [Member] \| Foreign Currency Gain (Loss) [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	17	13	$ (11)
Prepaid expenses and other \| Derivatives Designated as Hedging Instruments \| Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	318	43
Prepaid expenses and other \| Derivatives Designated as Hedging Instruments \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	470
Accrued Liabilities \| Derivatives Designated as Hedging Instruments \| Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(33)	(96)
Accrued Liabilities \| Derivatives Designated as Hedging Instruments \| Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	(774)
Accrued Liabilities \| Derivatives Designated as Hedging Instruments \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(1,402)	0
Accrued Liabilities \| Derivatives Not Designated as Hedging Instruments \| Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	(17)
Other Noncurrent Liabilities [Member] \| Derivatives Designated as Hedging Instruments \| Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(5,254)	(15,410)
Other Noncurrent Liabilities [Member] \| Derivatives Designated as Hedging Instruments \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ (1,894)	$ 0