Business Combinations (Supplemental Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Combinations [Abstract]
Total 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)