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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |  |
Net decrease in valuation allowances | $ 16,078 | $ 27,194 |  |
Tax credits, net capital and operating loss carryforwards | 829,260 | 797,091 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 245,843 | $ 244,711 |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2040 for $245,843 in net operating losses | Through 2039 for $244,711 in net operating losses |  |
Gross unrecognized tax benefits | $ 168,186 | $ 169,322 | $ 187,646 | $ 193,024
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 15,812 | 31,108 |  |
Interest and penalty releases net recognized in the income statement | 15,396 |  |  |
Tax benefit recognized in the statements of income, net of interest and penalty reversals |  | 4,679 |  |
Foreign tax benefit resulting from tax enactments related to COVID-19 | 4,964 |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 29,400 | 37,672 | 3,880 |
Release of gross unrecognized tax benefits offset by a net benefit included within income tax expense | 14,971 |  |  |
Tax benefit related to the release of withholding and income tax reserves for unremitting earnings | 28,795 | $ 28,795 | $ 28,795 |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Expected decrease in unrecognized tax benefits within next 12 months | $ 15,446 |  |  |
GUERNSEY |  |  |  |
Income Taxes [Line Items] |  |  |  |
Statutory Guernsey tax rate | 0.00% | 0.00% | 0.00% |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 47,582 |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax receivable balance | $ 58,336 | $ 53,143 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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