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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2012
Stock-Based Compensation |
Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards |
|  | Three-Months Ending |  | Six-Months Ending
|  | March 31, |  | March 31,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Expected term |  | 5.9 years |  | 5.8 years |  | 5.9 - 8.5 years |  | 5.8 - 8.7 years
Estimated volatility |  | 55.5% - 55.6% |  | 54.0% |  | 48.9% - 55.6% |  | 48.0% - 54.0%
Estimated dividend yield |  | 0.7% |  | 1.1% |  | 0.7% - 1.1% |  | 1.1% - 1.3%
Risk-free interest rate |  | 1.0% - 1.3% |  | 2.6% |  | 1.0% - 1.6% |  | 1.9% - 2.6%
Activity for Stock Option Awards |
|  | Three-Months Ending |  |  | Six-Months Ending |
|  | March 31, 2012 |  |  | March 31, 2012 |
|  | Number of options |  |  | Weighted- Average Exercise Price per Share |  |  | Number of options |  |  | Weighted- Average Exercise Price per Share |
Options, beginning balance |  |  | 4,858 |  |  | $ | 21.34 |  |  |  | 4,228 |  |  | $ | 20.12 |
Options granted |  |  | 20 |  |  |  | 43.27 |  |  |  | 845 |  |  |  | 26.00 |
Options exercised |  |  | (205 | ) |  |  | 13.90 |  |  |  | (390 | ) |  |  | 12.86 |
Options forfeited |  |  | — |  |  |  | n/a |  |  |  | (10 | ) |  |  | 26.83 |
Options, ending balance |  |  | 4,673 |  |  | $ | 21.76 |  |  |  | 4,673 |  |  | $ | 21.76 |
Changes in Nonvested Stock Options |
|  | Three-Months Ending |  |  | Six-Months Ending |
|  | March 31, 2012 |  |  | March 31, 2012 |
|  | Number of options |  |  | Weighted- Average Exercise Price per Share |  |  | Number of options |  |  | Weighted- Average Exercise Price per Share |
Options, beginning balance |  |  | 1,713 |  |  | $ | 26.80 |  |  |  | 1,368 |  |  | $ | 27.71 |
Options granted |  |  | 20 |  |  |  | 43.27 |  |  |  | 845 |  |  |  | 26.00 |
Options vested |  |  | (4 | ) |  |  | 29.00 |  |  |  | (476 | ) |  |  | 27.41 |
Options forfeited |  |  | — |  |  |  | n/a |  |  |  | (8 | ) |  |  | 26.83 |
Options, ending balance |  |  | 1,729 |  |  | $ | 26.99 |  |  |  | 1,729 |  |  | $ | 26.99 |
Stock Options Vested, Or Expected to Vest and Are Exercisable |
|  | Number |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Life in Years |  |  | Aggregate Intrinsic Value |
Options outstanding |  |  | 4,673 |  |  | $ | 21.76 |  |  |  | 6.1 |  |  | $ | 98,471 |
Options vested and exercisable |  |  | 2,944 |  |  |  | 18.69 |  |  |  | 4.5 |  |  |  | 71,059 |
Options vested and expected to vest |  |  | 4,505 |  |  |  | 21.55 |  |  |  | 5.9 |  |  |  | 95,871 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (e) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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