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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |  |  |
Net increase (decrease) in valuation allowances | $ (27,194) | $ 18,154 |  |
Tax credits, net capital and operating loss carryforwards | 797,091 | 894,997 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 244,711 | $ 322,816 |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2039 for $244,711 in net operating losses | Through 2038 for $322,816 in net operating losses |  |
Gross unrecognized tax benefits | $ 169,322 | $ 187,646 | $ 193,024 | $ 196,668
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 31,108 | 30,807 |  |
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits, tax expense (benefit) recognized in the statements of income, net of interest and penalty reversals | 4,679 | $ 2,579 |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Expected decrease in unrecognized tax benefits within next 12 months | $ 12,763 |  |  |
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 | $ 53,143 | $ 55,198 |  |

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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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