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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, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Compensation expense |  |  |
Excess tax benefit from share-based payment | $ 748,000 | $ 1,754,000 | $ 1,254,000
Employee Stock Option [Member] |  |  |
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) | 8,500,000 |  |
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 | 4,300,000 | 7,900,000 | 3,900,000
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 | 700,000 | 1,800,000 | 1,300,000
Performance Earnings Program [Member] |  |  |
Compensation expense |  |  |
Unrecognized compensation expense | 62,400,000 |  |
Period of recognition of unrecognized compensation expense | 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) [Member] |  |  |
Compensation expense |  |  |
Recognized compensation expense | 34,400,000 | 32,600,000 | 26,600,000
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.60 | $ 22.83 | $ 20.62
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 [Member] |  |  |
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) | 4,100,000 |  |
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 [Member] |  |  |
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) | 3,600,000 |  |
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 [Member] |  |  |
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) | $ 800,000 |  |
Options Exercisable |  |  |
Weighted Average Remaining Contractual Life | 7 months 28 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 32.53 |  |

X
- Definition Represents the high end of the range of the weighted average period between the balance sheet date and the expiration for all awards outstanding under the plan, which may be expressed in a decimal value for the number of years in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the low end of the range of the weighted average period between the balance sheet date and the expiration for all awards outstanding under the plan, which may be expressed in a decimal value for the number of years in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The period of time over which the employee needs to meet the performance objectives in order to qualify for the stock unit award in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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