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Income Taxes - Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits, Beginning balance | $ 187,646 | $ 193,024 | $ 196,668
Additions based on tax positions related to the current year | 19,530 | 20,329 | 22,319
Additions for tax positions of prior years | 24,980 |  | 12,261
Reduction for tax positions of prior years |  | (3,805) |
Settlements with tax authorities | (37,672) | (3,880) | (9,450)
Lapse of statute of limitations | (25,162) | (18,022) | (28,774)
Unrecognized tax benefits, Ending balance | $ 169,322 | $ 187,646 | $ 193,024

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