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Derivative Instruments (Derivative instruments in the condensed consolidated balance sheet) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (103)	$ (212)	$ (197)	$ (418)
Designated as Hedging Instrument \| Foreign exchange contracts \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	(239)		(239)		$ (75)
Designated as Hedging Instrument \| Foreign exchange contracts \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	26		26		213
Designated as Hedging Instrument \| Interest Rate Swap [Member] \| Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	4,124		4,124		3,299
Designated as Hedging Instrument \| Interest Rate Swap [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	1,245		1,245		662
Designated as Hedging Instrument \| Cross Currency Interest Rate Contract [Member] \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	(1,231)		(1,231)		(2,028)
Designated as Hedging Instrument \| Cross Currency Interest Rate Contract [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2,368		2,368		2,204
Designated as Hedging Instrument \| Cross Currency Interest Rate Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	(26,306)		(26,306)		(38,209)
Derivatives Not Designated as Hedging Instruments \| Foreign exchange contracts \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	(37)		(37)		$ (31)
Foreign currency exchange gain/loss \| Designated as Hedging Instrument \| Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,438	(5,891)	11,377	(18,176)
Foreign currency exchange gain/loss \| Derivatives Not Designated as Hedging Instruments \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(41)	11	(7)	12
Cost of products sold \| Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	11	(100)	39
Cost of products sold \| Designated as Hedging Instrument \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	492	407	1,367	(864)
Cost of products sold \| Designated as Hedging Instrument \| Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	634	(6,049)	9,647	(15,493)
Interest Expense [Member] \| Designated as Hedging Instrument \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 130	$ 112	$ 248	$ (516)