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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes [Line Items] |  |  |  |
Deferred income tax expenses as a result of enacted changes in tax laws or rates | $ 4,817 |  |  |
Corporate tax rate of the company | 0.00% | 0.00% | 0.00% |
Net increase (decrease) in valuation allowances | $ (2,297) | $ (15,295) |  |
Tax credits, net capital and operating loss carryforwards | 707,761 | 773,721 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 180,882 | 214,538 |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2036 for $180,882 in net operating losses |  |  |
Gross unrecognized tax benefits | $ 193,024 | 196,668 | $ 126,706 | $ 123,942
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 28,228 | 31,138 |  |
Accrued income taxes payable relating to unrecognized tax expense (benefit) recognized in the statements of income | (2,910) | $ 8,919 |  |
Expected decrease in unrecognized tax benefits within next 12 months | $ 17,360 |  |  |
September 30, 2016 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2036 for $214,538 in net operating losses |  |  |

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- Definition Tax credit net capital and operating loss carryforwards expiration dates. + References No definition available. + Details
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- Definition The sum of tax credits, net capital and operating loss carryforwards available to reduce future tax liabilities. + References No definition available. + Details
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- Definition Unrecognized tax benefits income tax penalties and interest expense benefit. + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount accrued 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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