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Income Taxes - Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 24.50% | 35.00% | 35.00%
Income tax provision at U.S. federal statutory rate | $ 46,119 | $ 52,963 | $ 50,599
State income taxes, net of U.S. federal benefit | 3,429 | 2,193 | 2,244
Foreign tax rate differential | (42) | (1,761) | (4,661)
Intercompany interest | 0 | (477) | (1,223)
Research credits | (3,486) | (2,572) | (4,398)
Domestic production deduction | (3,041) | (3,075) | (3,726)
Amended returns/audit settlements/statute expirations | (2,349) | (1,296) | (248)
Foreign | 4,040 | 744 | (1,702)
Valuation allowance | 1,907 | 2,512 | 1,262
Foreign tax credit | 1,320 | (1,342) | (3,286)
Excess tax benefits relating to stock-based compensation | (22,253) | (24,746) | 0
Tax effect of the Tax Act | 23,579 | 0 | 0
Other | (3,628) | (75) | 260
Total provision | $ 45,595 | $ 23,068 | $ 35,121

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- Definition Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amount + 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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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