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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Net operating loss carryforwards |  |  |  |
Cash and cash equivalents | $ 349,245 | $ 166,252 | $ 66,199 | $ 74,672
Income taxes paid | $ 65,300 | $ 87,800 | $ 108,300 |
Unrecognized tax benefits |  |  |  |
Statutory income tax rate (as a percent) | 24.50% | 35.00% | 35.00% |
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax (expense) benefit | $ (10,500) |  |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense (benefit) | 9,400 |  |  |
Unrecognized tax benefits that, if recognized, would affect the annual effective income tax rate | 1,300 | $ 1,100 |  |
Interest and penalties included in net liability balance | 700 | 700 |  |
Maximum |  |  |  |
Unrecognized tax benefits |  |  |  |
Interest expense recognized related to unrecognized tax benefits | 100 | $ 100 | $ 100 |
Foreign Tax Authority |  |  |  |
Net operating loss carryforwards |  |  |  |
Cash and cash equivalents | $ 47,100 |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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