Business Combinations (Supplemental Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Revenue		$ 3,290,734	$ 3,133,907
Net income (loss)		$ (228,234)	$ (128,889)
Net income (loss) per share, basic and diluted		$ (0.75)	$ (0.43)
Since Acquisition Date of March 10, 2020 [Member]
Business Acquisition [Line Items]
Revenue	$ 196,792
Net income (loss)	$ 297