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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |
Expense (benefit) from income taxes | $ 17,973 | $ (37,217) | $ 94,484 |
Federal net operating loss carryforwards | 120,000 |  |  |
State net operating loss carryforwards | 42,800 |  |  |
General business credits | 33,600 |  |  |
Alternative minimum tax credit |  | 4,600 |  |
Income tax, refund claim |  | 4,600 |  |
Decrease in valuation allowance | 0 | 0 | (27,370) |
Pre-tax income required to realize deferred tax assets prior to expiration | 915,500 |  |  |
Deferred tax asset valuation allowance | 39,185 | 38,486 |  |
Unrecognized tax benefits | 3,441 | 3,473 | $ 3,494 | $ 3,804
Uncertain tax positions to be reserved within twelve months | 83 |  |  |
Income Tax Credits and Adjustments | $ 9,200 | $ 9,200 |  |

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