Recent accounting pronouncements - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
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Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2017 |
Mar. 31, 2016 |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Tax benefit | $ 26,911 | $ 29,495 | $ 53,772 | $ 45,541 |
| Cash flows from operations | $ 136,848 | $ 21,864 | ||
| Accounting Standards Update 2016-09 | ||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Tax benefit | (2,200) | |||
| Cash flows from operations | $ 2,200 | |||
| Earnings per share, basic and diluted (in usd per share) | $ 0.03 | |||
| Common Stock | ||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| RSUs vested | 200 | 157 | 12 | |
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- Definition Stock Issued During Period, Shares, Restricted Stock Units, Vested No definition available.
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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