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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock
12 Months Ended
Sep. 30, 2020
$ / shares
shares
Weighted Average Price  
Nonvested shares, weighted average grant date fair value at beginning period (in dollars per share) | $ / shares $ 42.19
Nonvested shares granted, weighted average grant date fair value (in dollars per share) | $ / shares 18.84
Nonvested shares vested, weighted average grant date fair value (in dollars per share) | $ / shares 43.95
Nonvested shares forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 28.21
Nonvested shares, weighted average grant date fair value at ending period (in dollars per share) | $ / shares $ 22.27
Shares/Units Subject to Restriction  
Nonvested shares at beginning period (in shares) | shares 558,932
Nonvested shares granted (in shares) | shares 1,189,567
Nonvested shares vested (in shares) | shares (287,300)
Nonvested shares forfeited (in shares) | shares (126,360)
Nonvested shares at ending period (in shares) | shares 1,334,839