Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue From Contract With Customer [Abstract]
Revenues Recognized Over Time	$ 108,038	$ 69,346	$ 187,853	$ 114,284
Revenues recognized at a point in time	110,924	114,854	231,642	219,702
Total revenues recognized under ASC 606	218,962	184,200	419,495	333,986
Revenues recognized under ASC 840	1,355,934	1,060,950	2,546,944	1,835,644
Revenues recognized under ASC 944	52,578	46,425	98,892	92,200
Revenues recognized under ASC 320	36,780	33,333	71,779	50,315
Total revenues	$ 1,664,254	$ 1,324,908	$ 3,137,110	$ 2,312,145