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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Taxes [Line Items] |  |  |  |
Net decrease in valuation allowances | $ 3,905 | $ 16,078 |  |
Tax credits, net capital and operating loss carryforwards | 756,414 | 829,260 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 170,430 | $ 245,843 |  |
Tax Credit net capital and operating loss Carryforwards Expiration Dates | Through 2041 for $170,430 tax credit, net capital and operating loss carryforwards | Through 2040 for $245,843 tax credit, net capital and operating loss carryforwards |  |
Gross unrecognized tax benefits | $ 195,196 | $ 168,186 | $ 169,322 | $ 187,646
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 25,011 | 15,812 |  |
Tax benefit recognized in the statements of income, net of interest and penalty reversals | 9,199 | 15,396 |  |
Tax benefit related to the release of withholding and income tax reserves for unremitting earnings | 28,795 | $ 28,795 |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Expected decrease in unrecognized tax benefits within next 12 months due to lapse of statutes of limitations | $ 3,559 |  |  |
GUERNSEY |  |  |  |
Income Taxes [Line Items] |  |  |  |
Statutory Guernsey tax rate | 0.00% | 0.00% | 0.00% |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax receivable balance | $ 53,925 | $ 58,336 |  |

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- Definition Amount of expense (benefit) for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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