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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes [Line Items] |  |  |  |
Net Increase (Decrease) in valuation allowances | $ 1,700 | $ (4,652) |  |
Tax credits, net capital and operating loss carryforwards | 557,390 | 699,023 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 137,406 | $ 202,193 |  |
Tax credit net capital and operating loss carryforwards expiration dates | through 2045 | through 2044 |  |
Gross unrecognized tax benefits | $ 170,532 | $ 151,822 | $ 196,949 | $ 213,031
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 38,090 | 30,495 |  |
Interest and penalties recognized in the statements of income, relating to unrecognized tax expense (benefit) | 7,595 | 4,617 |  |
Unrecognized deferred tax liability for undistributed earnings of foreign subsidiary due to indefinitely reinvestment | 133,020 | $ 101,725 |  |
Fiscal Year 2026 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Expected decrease in unrecognized tax benefits within next 12 months due to lapse of statutes of limitations | $ 17,045 |  |  |
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 | $ 55,854 | $ 37,249 |  |

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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 Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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