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Stock-Based Compensation - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2021 USD ($) $ / shares shares | Feb. 17, 2021 $ / shares | Oct. 31, 2021 USD ($) director $ / shares shares | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) director $ / shares shares | Sep. 30, 2020 USD ($)
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  | $ 10,300,000 | $ 11,400,000 | $ 26,300,000 | $ 36,000,000
Company's non-employee directors retirement | director |  |  |  |  |  |  | 1 |
Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Stock option awards (in shares) | shares | 1,577,554 |  |  |  |  |  |  |
Grant date value merger consideration | $ |  |  | $ 14,600,000 |  |  |  |  |
Company's non-employee directors resignation | director |  |  | 3 |  |  |  |  |
Minimum | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 8.47 |  |  |  |  |  |  |
Maximum | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 28.72 |  |  |  |  |  |  |
Restricted Stock Awards | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares | 3,364,354 |  |  |  |  |  |  |
Granted (in dollars per share) | $ 22.25 |  |  |  |  |  |  |
Grant date value merger consideration remaining fair value | $ | $ 23,500,000 |  |  |  |  |  |  |
Restricted Stock Awards | Minimum | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting period | 2 months |  |  |  |  |  |  |
Restricted Stock Awards | Maximum | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  | 244,433 |
Granted (in dollars per share) |  |  |  |  |  |  | $ 14.08 |
Restricted Stock Units | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  | 321,663 |  |  |  |  |
Granted (in dollars per share) |  |  | $ 19.29 |  |  |  |  |
Restricted Stock Units | Director |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  | 107,156 |
Granted (in dollars per share) |  |  |  |  |  |  | $ 18.50 |
Restricted Stock Units | Executive Officer | Subsequent event | Share-based Payment Arrangement, Employee |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares | 258,252 |  |  |  |  |  |  |
Granted (in dollars per share) | $ 22.25 |  |  |  |  |  |  |
Award vesting period | 6 months |  |  |  |  |  |  |
Performance Share Awards | Minimum |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  |  |  |  | 0.00% |
Performance Share Awards | Maximum |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  |  |  |  | 4.00% |
Performance Share Awards Based on Internal Performance Metrics |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Right to receive additional shares, maximum |  |  |  |  |  |  | 100.00% |
Employee Performance Share Awards |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  | 696,280 |
Granted (in dollars per share) |  |  |  |  |  |  | $ 18.58 |
Award vesting period |  |  |  |  |  |  | 3 years |
Minimum operating cash flow for the year preceding the performance period | $ |  |  |  |  |  |  | $ 100,000,000 |
Employee Performance Share Awards | Tranche three |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 100.00% |
Hybrid Performance Share Awards |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  | 423,171 |
Granted (in dollars per share) |  |  |  |  |  |  | $ 18.58 |
Minimum operating cash flow for the year preceding the performance period | $ |  |  |  |  |  |  | $ 100,000,000 |
Hybrid Performance Share Awards | Forecast |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  | $ 7,600,000 |  |  |  |
Hybrid Performance Share Awards | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Vested (in shares) | shares | 960,497 |  |  |  |  |  |  |
Vested (in dollars per share) | $ 18.45 |  |  |  |  |  |  |
Hybrid Performance Share Awards | Tranche one |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 25.00% |
Hybrid Performance Share Awards | Tranche two |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 25.00% |
Hybrid Performance Share Awards | Tranche three |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 50.00% |
Performance Shares Based on Market Conditions |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Right to receive shares |  |  |  |  |  |  | 100.00% |
Right to receive an additional award in cash |  |  |  |  |  |  | 100.00% |
TSR Performance Share Awards |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  | 723,224 |
Granted (in dollars per share) |  | $ 16.07 |  |  |  |  |  |
Performance period |  |  |  |  |  |  | 3 years |
TSR Performance Share Awards | Forecast |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  | $ 10,300,000 |  |  |  |
TSR Performance Share Awards | Subsequent event |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Award vesting rights (as a percent) | 100.00% |  |  |  |  |  |  |
Vested (in shares) | shares | 2,122,077 |  |  |  |  |  |  |
Vested (in dollars per share) | $ 16.30 |  |  |  |  |  |  |
TSR Performance Share Awards | Minimum |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  | $ 0.94 |
TSR Performance Share Awards | Maximum |  |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  | $ 7.76 |

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