Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	$ 0	$ 307	$ 10,205
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	22,143	6,351	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	45	233	142
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	532	386	384
Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	0	0	10,205
Interest Rate Swap Agreements [Member] | Other Long-Term Liabilities [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	21,381	6,351	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	307	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	45	233	142
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	762	0	0
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	$ 532	$ 386	$ 384