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Income Taxes - Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 24.50%
Income tax provision at U.S. federal statutory rate | $ 53,970 | $ 45,375 | $ 38,495
State income taxes, net of U.S. federal benefit | 4,619 | 4,194 | 2,755
Foreign tax rate differential | 493 | 839 | (649)
Research credits | (5,868) | (5,761) | (3,486)
Domestic production deduction | 0 | 0 | (2,421)
Amended returns/audit settlements/statute expirations | (1,085) | (2,268) | (2,349)
Foreign | 7,513 | 11,177 | 4,040
Valuation allowance | 5,332 | (333) | 1,907
Foreign tax credit and tax withholding | 2,086 | (464) | 1,320
Excess tax benefits relating to stock-based compensation | (45,086) | (24,891) | (22,253)
Tax effect of the Tax Act | 0 | 0 | 16,719
GILTI, FDII and BEAT | 5,050 | 1,931 | 0
Other | (6,435) | (5,851) | (3,628)
Total provision | $ 20,589 | $ 23,948 | $ 30,450

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + 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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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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