Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	$ 10,205	$ 8,281	$ 1,640
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	0	123	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	142	341	394
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	384	269	248
Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	10,205	8,262	1,640
Interest Rate Swap Agreements [Member] | Other Long-Term Liabilities [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	0	0	0
Forward Foreign Currency Exchange Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	0	19	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	142	341	394
Forward Foreign Currency Exchange Contract [Member] | Accounts Payable and Accrued Expenses [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	0	123	0
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	$ 384	$ 269	$ 248