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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Taxes [Line Items] |  |  |  |
Corporate tax rate of the company | 0.00% | 0.00% | 0.00% |
Net increase (decrease) in valuation allowances | $ (15,295) | $ (16,042) |  |
Tax credits, net capital and operating loss carryforwards | 773,721 | 451,247 |  |
Tax credits, net capital and operating loss carryforwards having expiration date | $ 214,538 | 98,912 |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2036 for $214,538 in net operating losses |  |  |
Gross unrecognized tax benefits | $ 196,668 | 126,706 | $ 123,942 | $ 130,371
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits | 31,138 | 22,219 |  |
Accrued income taxes payable recognized in the statements of income | 8,919 | $ 1,364 |  |
Expected decrease in unrecognized tax benefits within next 12 months | $ 28,066 |  |  |
September 30, 2014 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits, net capital and operating loss carryforwards expiration date | Through 2035 for $98,912 in net operating losses |  |  |

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- Definition Tax credits, net capital and operating loss carryforwards to expire within 20 years of balance sheet date. + 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 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 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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