Derivative Instruments (Derivative instruments in the condensed consolidated balance sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Derivatives Designated as Hedging Instruments | Foreign Exchange Contract [Member] | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 213	$ 161
Derivatives Designated as Hedging Instruments | Foreign Exchange Contract [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	75	(123)
Derivatives Designated as Hedging Instruments | Interest Rate Swap [Member] | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	3,299	1,394
Derivatives Designated as Hedging Instruments | Interest Rate Swap [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	0	1,808
Derivatives Designated as Hedging Instruments | Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	662	0
Derivatives Designated as Hedging Instruments | Currency Swap [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2,028	121
Derivatives Designated as Hedging Instruments | Currency Swap [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	2,204	3,237
Derivatives Designated as Hedging Instruments | Currency Swap [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	38,209	7,459
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract [Member] | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	2
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 31	$ 22