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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax computed at statutory rate | $ 14,971 | $ (24,494) | $ 12,112
State income taxes, net of federal benefit | 1,300 | (590) | 111
Deferred rate change | 260 | (88) | 110,071
Decrease in valuation allowance - other | 0 | 0 | (27,370)
Changes in uncertain tax positions | (2) | (7) | 598
Permanent differences | 2,177 | 2,908 | 2,133
Tax credits | (939) | (14,902) | (3,174)
Other, net | 206 | (44) | 3
Total expense (benefit) | $ 17,973 | $ (37,217) | 94,484
Income Tax Contingency [Line Items] |  |  |
Federal tax rate for fiscal year provision, percent | 24.50% |  |
State and Local Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Valuation allowances and reserves, adjustments |  |  | $ 27,400

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