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Income Taxes Computed at Federal Statutory Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before taxes | $ (71,227) | $ (14,353) | $ 114,279 | $ 20,327 | $ (32,629) | $ (15,963) | $ 117,316 | $ 52,688 | $ 49,026 | $ 121,412 | $ 76,543
Provision for income taxes: |  |  |  |  |  |  |  |  |  |  |
Tax at Federal statutory rate |  |  |  |  |  |  |  |  | 10,295 | 25,496 | 16,074
State taxes net of federal benefit |  |  |  |  |  |  |  |  | 3,251 | 7,927 | 5,224
Permanent differences |  |  |  |  |  |  |  |  | 249 | 196 | 89
Change in valuation allowance |  |  |  |  |  |  |  |  | 208 | 86 | (113)
Other |  |  |  |  |  |  |  |  | (265) | (30) | (649)
Income tax expense |  |  |  |  |  |  |  |  | $ 13,738 | $ 33,675 | $ 20,625

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