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Stock-Based Employee Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Assumptions Used to Estimate Fair Value of Stock Options | We used the following assumptions to estimate the fair value of our stock options during fiscal 2014, 2013 and 2012:
| Year Ended September 30, |
| 2014 |  |  | 2013 |  |  | 2012 |
Stock Options: |  |  |  |  |  |  |  |
Average expected term (years) | 4.04 |  |  | 4.10 |  |  | 4.31 |
Expected volatility (range) | 35-36 | % |  | 35-37 | % |  | 38-41 | %
Weighted average volatility | 35 | % |  | 37 | % |  | 40 | %
Risk-free interest rate (range) | 0.8 - 1.2 | % |  | 0.5 - 1.1 | % |  | 0.5 - 1.5 | %
Average expected dividend yield | 0.2 | % |  | 0.2 | % |  | 0.3 | %
Expected dividend yield (range) | 0.2 | % |  | 0.2 | % |  | 0.2-0.3 | %
Summary of Option Activity | The following table summarizes option activity during fiscal 2014:
| Shares |  | Weighted- average Exercise Price |  | Weighted- average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (In thousands) |  |  |  | (In years) |  | (In thousands)
Outstanding at October 1, 2013 | 2,687 |  |  | $ | 35.48 |  |  |  |  |
Granted | 58 |  |  | 53.82 |  |  |  |  |
Exercised | (583 | ) |  | 33.91 |  |  |  |  |
Forfeited | (68 | ) |  | 41.30 |  |  |  |  |
Expired | (5 | ) |  | 35.37 |  |  |  |  |
Outstanding at September 30, 2014 | 2,089 |  |  | $ | 36.24 |  |  | 4.31 |  | $ | 39,436 |
Options exercisable at September 30, 2014 | 998 |  |  | $ | 33.28 |  |  | 3.85 |  | $ | 21,787 |
Vested and expected to vest at September 30, 2014 | 1,990 |  |  | $ | 35.97 |  |  | 4.28 |  | $ | 38,090 |
Summary of Restricted Stock Unit Activity | The following table summarizes the RSUs activity during fiscal 2014:
| Shares |  | Weighted-average Grant-date Fair Value
| (In thousands) |  |
Outstanding at October 1, 2013 | 1,424 |  |  | $ | 38.02 |
Granted | 640 |  |  | 56.23 |
Released | (480 | ) |  | 35.56 |
Forfeited | (144 | ) |  | 40.54 |
Outstanding at September 30, 2014 | 1,440 |  |  | $ | 46.68 |
Summary of Performance Stock Unit Activity | The following table summarizes the PSUs activity during fiscal 2014:
| Shares |  | Weighted- average Grant-date Fair Value
| (In thousands) |  |
Outstanding at October 1, 2013 | 292 |  |  | $ | 38.96 |
Granted | 176 |  |  | 56.63 |
Released | (87 | ) |  | 38.64 |
Outstanding at September 30, 2014 | 381 |  |  | $ | 47.19 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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