Income Taxes - Current and Deferred Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Deferred Income Tax Assets And Liabilities
Income (loss) before income taxes	$ (37,918)	$ (23,090)	$ 165,012	$ 143,496
Current income tax expense (benefit)	(5,750)	(5,429)	38,944	30,958
Deferred income tax expense (benefit)	(4,179)	(1,032)	9,984	10,372
Total income tax expense (benefit)	$ (9,929)	$ (6,461)	$ 48,928	$ 41,330

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details