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Stock Plans (Details 2) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Compensation expense |  |  |
Excess tax benefit from share-based payment | $ 1,754,000 | $ 1,254,000 | $ 61,248,000
Stock options |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 1.6 |  |
Weighted Average Remaining Contractual Life | 2 years 6 months 11 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 24.73 |  |
Aggregate Intrinsic Value (in millions) | 10,100,000 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 1.4 |  |
Weighted Average Remaining Contractual Life | 2 years 4 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 24.51 |  |
Stock Incentive Plans, additional disclosures |  |  |
Remaining contractual life of options outstanding, low end of range | 1 month 6 days |  |
Remaining contractual life of options outstanding, high end of range | 4 years 6 months 4 days |  |
Aggregate intrinsic value of stock options exercised | 7,900,000 | 3,900,000 | 7,800,000
Compensation expense |  |  |
Recognized compensation expense | 300,000 | 2,400,000 | 4,600,000
Unrecognized compensation expense | 200,000 |  |
Period of recognition of unrecognized compensation expense | 3 years |  |
Excess tax benefit from share-based payment | 1,800,000 | 1,300,000 | 61,200,000
Performance Earnings Program |  |  |
Compensation expense |  |  |
Unrecognized compensation expense | 52,400,000 |  |
Period of recognition of unrecognized compensation expense | 3 years |  |
Performance period over which objectives must be met to qualify for an award grant | 3 years |  |
Restricted stock units |  |  |
Compensation expense |  |  |
Recognized compensation expense | 31,100,000 | 24,100,000 | 20,400,000
Unrecognized compensation expense | 52,400,000 |  |
Period of recognition of unrecognized compensation expense | 3 years |  |
Range of Exercise Prices from $14.20 to $23.94 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | $ 14.20 |  |
Exercise price, high end of range (in dollars per share) | $ 23.94 |  |
Range of Exercise Prices from $14.20 to $23.94 | Stock options |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.6 |  |
Weighted Average Remaining Contractual Life | 1 year 10 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 22.20 |  |
Aggregate Intrinsic Value (in millions) | 5,800,000 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.6 |  |
Weighted Average Remaining Contractual Life | 1 year 10 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 22.20 |  |
Range of Exercise Prices from $24.45 to $26.47 |  |  |
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) | $ 26.47 |  |
Range of Exercise Prices from $24.45 to $26.47 | Stock options |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.4 |  |
Weighted Average Remaining Contractual Life | 2 years 11 months 16 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 24.56 |  |
Aggregate Intrinsic Value (in millions) | 2,400,000 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.4 |  |
Weighted Average Remaining Contractual Life | 2 years 11 months 16 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 24.56 |  |
Range of Exercise Prices from $27.00 to $34.00 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | $ 27.00 |  |
Exercise price, high end of range (in dollars per share) | $ 34.00 |  |
Range of Exercise Prices from $27.00 to $34.00 | Stock options |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 0.6 |  |
Weighted Average Remaining Contractual Life | 2 years 11 months 26 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 27.84 |  |
Aggregate Intrinsic Value (in millions) | $ 1,900,000 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 0.4 |  |
Weighted Average Remaining Contractual Life | 2 years 8 months 5 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 27.91 |  |
Range of Exercise Prices from $14.20 to $34.00 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | $ 14.20 |  |
Exercise price, high end of range (in dollars per share) | $ 34.00 |  |

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