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Stock Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Compensation expense |  |  |
Excess tax benefit from share-based payment | $ 748 | $ 1,754 | $ 1,254
Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 1.6 |  |
Weighted Average Remaining Contractual Life | 4 years 8 months 9 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 27.69 |  |
Aggregate Intrinsic Value (in millions) | $ 8,500 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.9 |  |
Weighted Average Remaining Contractual Life | 1 year 7 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.16 |  |
Stock Incentive Plans, additional disclosures |  |  |
Remaining contractual life of options outstanding, low end of range | 11 days |  |
Remaining contractual life of options outstanding, high end of range | 9 years 5 months 5 days |  |
Aggregate intrinsic value of stock options exercised | $ 4,300 | 7,900 | 3,900
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 7.83 |  |
Excess tax benefit from share-based payment | $ 700 | $ 1,800 | $ 1,300
Performance Earnings Program |  |  |
Compensation expense |  |  |
Unrecognized compensation expense | $ 62,400 |  |
Vesting period | 3 years |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.32 | $ 22.27 | $ 20.58
Performance period over which objectives must be met to qualify for an award grant | 3 years |  |
Restricted Stock Units (RSUs) |  |  |
Compensation expense |  |  |
Recognized compensation expense | $ 34,400 | $ 32,600 | $ 26,600
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.60 | $ 22.83 | $ 20.62
Parent |  |  |
Compensation expense |  |  |
Excess tax benefit from share-based payment | $ 700 | $ 1,700 | $ 1,300
Exercise Price Range from Dollars 21.01 to Dollars 23.94 [Member] |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | $ 21.01 |  |
Exercise price, high end of range (in dollars per share) | $ 23.94 |  |
Exercise Price Range from Dollars 21.01 to Dollars 23.94 [Member] | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.4 |  |
Weighted Average Remaining Contractual Life | 1 year 2 months 5 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 23.46 |  |
Aggregate Intrinsic Value (in millions) | $ 4,100 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.4 |  |
Weighted Average Remaining Contractual Life | 1 year 2 months 5 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 23.46 |  |
Exercise Price Range from Dollars 24.45 to Dollars 26.47 [Member] |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | 24.45 |  |
Exercise price, high end of range (in dollars per share) | $ 28.67 |  |
Exercise Price Range from Dollars 24.45 to Dollars 26.47 [Member] | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.5 |  |
Weighted Average Remaining Contractual Life | 2 years 22 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 26.24 |  |
Aggregate Intrinsic Value (in millions) | $ 3,600 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.5 |  |
Weighted Average Remaining Contractual Life | 2 years 22 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 26.24 |  |
Exercise Price Range from Dollars 30.96 to Dollars 34.00 [Member] |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | 30.96 |  |
Exercise price, high end of range (in dollars per share) | $ 34.00 |  |
Exercise Price Range from Dollars 30.96 to Dollars 34.00 [Member] | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.7 |  |
Weighted Average Remaining Contractual Life | 9 years 2 months 1 day |  |
Weighted Average Exercise Price (in dollars per share) | $ 31.65 |  |
Aggregate Intrinsic Value (in millions) | $ 800 |  |
Options Exercisable |  |  |
Weighted Average Remaining Contractual Life | 7 months 28 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 32.53 |  |

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