Supplemental disclosures (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Sep. 30, 2014 |
Sep. 30, 2013 |
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| Cash and cash equivalents | ||||||
| Cash and cash equivalents | $ 81,877 | $ 182,942 | $ 81,877 | $ 182,942 | $ 158,112 | $ 125,617 |
| Percentage of cash and cash equivalents denominated and held in jurisdictions outside the United States | 80.00% | 80.00% | ||||
| Foreign currency translation adjustments | $ 8,339 | $ 6,366 | $ (12,694) | 4,919 | ||
| Effect of exchange rate changes on cash and cash equivalents | (4,559) | 1,329 | ||||
| Decline in goodwill value | (4,686) | |||||
| Deferred compensation plan | ||||||
| Investments in mutual funds | $ 9,500 | 9,500 | ||||
| Income taxes | ||||||
| Income taxes paid | $ 47,800 | $ 57,400 | ||||
| X | ||||||||||
- Definition Represents the percentage of cash and cash equivalents in jurisdictions outside the United States. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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