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Income taxes Income taxes - Reconciliation of Tax Provision Using the Federal Statutory Income Tax Rate to Reported Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Reconciliation of actual provision for income taxes and provision for income taxes resulting from the use of federal statutory income tax |  |  |
Federal income tax provision at statutory rate of 24.5%, 35% and 35% | $ 73,396 | $ 109,982 | $ 100,089
State income taxes, net of federal benefit | 12,348 | 10,554 | 10,723
Foreign taxation | (1,531) | (6,940) | (3,976)
Permanent items | 1,176 | 970 | 1,284
Tax credits | (2,438) | (4,851) | (1,592)
Toll tax | 9,425 | 0 | 0
Deferred tax liability - tax rate change | (10,514) | 0 | 0
Vesting of equity compensation | (2,849) | (6,569) | 0
Other | (620) | (1,093) | (720)
Provision for income taxes | $ 78,393 | $ 102,053 | $ 105,808
Statutory income tax rate (as a percent) | 24.50% | 35.00% | 35.00%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: 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 + Details
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