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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes [Line Items] |  |  |  |
Net decrease in valuation allowances | $ 9,297 | $ 8,682,000 |  |
Tax credits, net capital and operating loss carryforwards | 591,626 | 516,270,000 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 85,347 | $ 104,079,000 |  |
Tax credit net capital and operating loss carryforwards expiration dates | Through 2042 for $104,079 tax credit, net capital and operating loss carryforwards | Through 2042 for $104,079 tax credit, net capital and operating loss carryforwards |  |
Gross unrecognized tax benefits | $ 196,949,000 | $ 213,031,000 | $ 195,196,000 | $ 168,186,000
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 35,065,000 | 35,471,000 |  |
Interest and penalties recognized in the statements of income, relating to unrecognized tax benefits (net of reversals) | (2,253) | 10,460,000 |  |
Unrecognized deferred tax liability for undistributed earnings of foreign subsidiary due to indefinitely reinvestment | 81,700,000 | $ 59,000,000 |  |
Fiscal Year 2024 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefits Reduce | 51,566 |  |  |
Expected decrease in unrecognized tax benefits within next 12 months due to lapse of statutes of limitations | $ 13,028 |  |  |
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 | $ 44,531 | $ 56,959 |  |

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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 Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482603/740-30-50-2 + Details
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