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Fair Value Measurements (Reconciliation of Fair Value Derivative Using Unobservable Inputs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Measurements [Abstract]    
Balance at beginning of period $ 81,264 $ 59,116
Increase in fair value based on ASC 505 equity-based compensation 20,135
Settlements due to exercise of awards (5,077) (1,297)
Change in fair value of equity-based awards (33,409) 3,310
Settlement as component of Merger purchase price (42,778)
Balance at end of period $ 81,264