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Share-based Payments (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2015
Compensation expense |  |  |
Recognized compensation expense | $ 42,000 | $ 77,900 |
Accelerated equity award |  | 43,900 |
Accelerated settlement Of Common Stock | 17,600 |  |
Award settlement Of Cash | 26,300 |  |
Unrecognized compensation expense | $ 143,000 |  | $ 115,500
Vesting period | 3 years |  |
Excess tax benefit from share-based payment | $ 3,335 | $ 2,560 |
Employee Stock Option |  |  |
Number of Options |  |  |
Balance at the beginning of the period (in shares) | 1.3 | 1.6 |
Exercised (in shares) | (0.2) | (0.1) |
Balance at the end of the period (in shares) | 1.1 | 1.5 |
Vested and expected to vest in the future at the end of the period (in shares) | 1.1 | 1.5 |
Stock options, Weighted Average Exercise Price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 28.26 | $ 27.69 |
Exercised (in dollars per share) | 23.36 | 25.82 |
Cancelled (in dollars per share) |  | 27.08 |
Balance at the end of the period (in dollars per share) | 29.44 | 27.89 |
Vested and expected to vest in the future at the end of the period (in dollars per share) | $ 29.44 | 27.89 |
Performance Earnings Program |  |  |
Compensation expense |  |  |
Vesting period | 3 years |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.92 | 32.32 |
Restricted Stock Units (RSUs) |  |  |
Compensation expense |  |  |
Granted (in shares) | 2.6 |  |
Granted (in dollars per share) | $ 30.04 |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.80 | $ 31.02 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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