Accumulated Other Comprehensive Income (Loss) (Summary Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 3,285,447	$ 1,132,487
Change associated with foreign currency translation	6,353	226
Balance	3,239,354	1,131,424
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(7,084)	(1,565)
Change associated with foreign currency translation	6,353	226
Balance	(731)	(1,339)
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(288)	(1,691)
Change associated with current period hedging	(4,459)	(5,117)
Reclassification into earnings	275	(314)
Balance	(4,472)	(6,700)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(7,372)	(3,256)
Change associated with foreign currency translation	6,353	226
Change associated with current period hedging	(4,459)	(5,117)
Reclassification into earnings	275	(314)
Balance	$ (5,203)	(8,039)
ASU 2018-02 [Member] | Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		422
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		422
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		$ 422