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Stockholder's Equity - Schedule of Non-vested Restricted Stock Units (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Time-Based Restricted Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested, Shares, Granted 2,758,634
Non-vested, Shares, Vested (642,404)
Non-vested, Shares, Forfeited (73,312)
Non-vested, Shares, Ending balance 2,042,918
Performance-Based Restricted Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested, Shares, Granted 778,968
Non-vested, Shares, Forfeited (7,581)
Non-vested, Shares, Ending balance 771,387
Restricted Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested, Shares, Granted 3,537,602
Non-vested, Shares, Vested (642,404)
Non-vested, Shares, Forfeited (80,893)
Non-vested, Shares, Ending balance 2,814,305
Non-vested, Shares, Expected to vest 2,814,305
Granted | $ / shares $ 18.87
Vested | $ / shares 20.06
Forfeited | $ / shares 17.54
Non-vested at September 30, 2020 | $ / shares 18.63
Expected to vest | $ / shares $ 18.63
Non-vested, Weighted-Average Remaining Contractual Term (years), Balance 11 months 23 days
Non-vested, Weighted-Average Remaining Contractual Term (years), Expected to vest 11 months 23 days
Non-vested, Aggregate Intrinsic Value, Balance | $ $ 137,529
Non-vested, Aggregate Intrinsic Value, Expected to vest | $ $ 137,529