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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended | |||||||||
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Jun. 30, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2013
Unvested restricted stock units
Maximum
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| Earnings per share | |||||||||||||
| Stock split | 2 | ||||||||||||
| Numerator: | |||||||||||||
| Income from continuing operations | $ 117,125 | $ 76,099 | $ 82,142 | ||||||||||
| Income (loss) from discontinued operations | (394) | 34 | (974) | ||||||||||
| Net income | $ 35,626 | $ 28,100 | $ 31,689 | $ 21,316 | $ 23,671 | $ 20,485 | $ 14,273 | $ 17,704 | $ 116,731 | $ 76,133 | $ 81,168 | ||
| Denominator: | |||||||||||||
| Weighted average shares outstanding | 68,165,000 | 67,734,000 | 68,834,000 | ||||||||||
| Effect of dilutive securities: | |||||||||||||
| Employee stock options and unvested restricted stock units (in shares) | 1,728,000 | 1,877,000 | 2,228,000 | ||||||||||
| Denominator for diluted earnings per share | 69,893,000 | 69,611,000 | 71,062,000 | ||||||||||
| Awards excluded from the calculation of diluted earnings per share (in shares) | |||||||||||||
| Awards excluded from the calculation of diluted earnings per share (in shares) | 30,000 | ||||||||||||
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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