Earnings Per Share (Details) (USD $) In Thousands, except Share data |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2011 |
Sep. 30, 2011 |
Jun. 30, 2011 |
Mar. 31, 2011 |
Dec. 31, 2010 |
Sep. 30, 2010 |
Jun. 30, 2010 |
Mar. 31, 2010 |
Dec. 31, 2009 |
Sep. 30, 2011 |
Sep. 30, 2010 |
Sep. 30, 2009 |
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| Earnings Per Share | ||||||||||||
| Authorized stock split declared and distributed, number of shares per each share held | 2 | |||||||||||
| Numerator: | ||||||||||||
| Income from continuing operations | $ 82,142 | $ 69,397 | $ 53,841 | |||||||||
| Income (loss) from discontinued operations | 18 | (68) | (819) | (105) | 1,032 | 1,200 | 752 | (1,972) | (974) | 1,012 | (7,301) | |
| Net income | $ 25,575 | $ 19,892 | $ 18,219 | $ 17,482 | $ 21,713 | $ 17,325 | $ 18,743 | $ 12,628 | $ 81,168 | $ 70,409 | $ 46,540 | |
| Denominator: | ||||||||||||
| Weighted average shares outstanding (in shares) | 34,417,000 | 34,827,000 | 35,141,000 | |||||||||
| Effect of dilutive securities: | ||||||||||||
| Employee stock options and unvested restricted stock units (in shares) | 1,114,000 | 1,103,000 | 632,000 | |||||||||
| Denominator for diluted earnings per share (in shares) | 35,531,000 | 35,930,000 | 35,773,000 | |||||||||
Restricted stock units |
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| Anti-dilutive securities excluded from computation of earnings per share | ||||||||||||
| Unvested restricted stock units excluded from the calculation of diluted earnings per share | 15,000 | |||||||||||
| X | ||||||||||
- 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 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.
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- Definition This element represents the income or loss from continuing operations attributable to the parent which may also be 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, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (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 This item represents the conversion ratio used in the calculation of a stock split. 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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