Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenues Recognized Over Time	$ 51,161	$ 31,695	$ 165,445	$ 119,760
Revenues recognized at a point in time	84,820	64,802	304,522	242,238
Total revenues recognized under ASC 606	135,981	96,497	469,967	361,998
Revenues recognized under ASC 840	945,024	745,378	2,780,668	2,540,372
Revenues recognized under ASC 944	53,397	52,223	145,597	152,344
Revenues recognized under ASC 320	35,580	33,782	85,895	102,629
Total revenues	$ 1,169,982	$ 927,880	$ 3,482,127	$ 3,157,343