Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	$ 1	$ 0	$ 0
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	38,091	48,630	22,143
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	290	314	45
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	418	4,375	532
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	0
Interest Rate Swap Agreements [Member] | Other Long-Term Liabilities [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	37,109	37,163	21,381
Forward Foreign Currency Exchange Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	1	0	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	290	314	45
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	982	11,467	762
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	$ 418	$ 4,375	$ 532