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Stock Incentive Plans - Schedule of RSUs (Details) - RSUs - $ / shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Number of Shares      
Equity instruments other than options nonvested - beginning balance (in shares) 4,174,476 2,809,775 3,985,616
Equity instruments other than options nonvested - granted (in shares) 8,026,810 3,166,405 1,136,002
Equity instruments other than options nonvested - issued due to separation modification (in shares)     649,649
Equity instruments other than options nonvested - released/issued (in shares) (1,249,681) (1,039,346) (2,207,467)
Equity instruments other than options nonvested - canceled/forfeited (in shares) (2,625,385) (762,358) (754,025)
Equity instruments other than options nonvested - ending balance (in shares) 8,326,220 4,174,476 2,809,775
Weighted Average Grant Date Fair Value      
Weighted average fair value other than options - beginning balance (in dollars per share) $ 55.45 $ 67.27 $ 47.25
Weighted average fair value other than options - granted (in dollars per share) 20.92 45.58 77.10
Weighted average fair value other than options - issued due to separation modification (in dollars per share)     51.98
Weighted average fair value other than options - released/issued (in dollars per share) 52.82 54.39 33.05
Weighted average fair value other than options - canceled/forfeited (in dollars per share) 35.16 59.46 62.01
Weighted average fair value other than options - ending balance (in dollars per share) $ 28.98 $ 55.45 $ 67.27
Nonemployee director incentives      
Number of Shares      
Equity instruments other than options nonvested - beginning balance (in shares) 114,615 75,750 66,386
Equity instruments other than options nonvested - granted (in shares) 118,500 62,200 19,200
Equity instruments other than options nonvested - issued due to separation modification (in shares)     10,488
Equity instruments other than options nonvested - released/issued (in shares) (48,455) (23,335) (20,324)
Equity instruments other than options nonvested - canceled/forfeited (in shares) 0 0 0
Equity instruments other than options nonvested - ending balance (in shares) 184,660 114,615 75,750
Weighted Average Grant Date Fair Value      
Weighted average fair value other than options - beginning balance (in dollars per share) $ 37.69 $ 46.31 $ 37.26
Weighted average fair value other than options - granted (in dollars per share) 18.82 35.90 87.88
Weighted average fair value other than options - issued due to separation modification (in dollars per share)     37.69
Weighted average fair value other than options - released/issued (in dollars per share) 26.90 60.90 51.59
Weighted average fair value other than options - canceled/forfeited (in dollars per share) 0 0 0
Weighted average fair value other than options - ending balance (in dollars per share) $ 28.42 $ 37.69 $ 46.31