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Debt (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 Notes Payable to Banks [Member] | Sep. 30, 2013 Notes Payable to Banks [Member] | Sep. 30, 2014 Notes Payable to Banks [Member] Minimum [Member] item | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] | Jun. 30, 2013 Notes Payable to Banks June 2013 Agreement [Member] | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Base Rate [Member] | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Base Rate [Member] Maximum | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Base Rate [Member] Minimum [Member] | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Debt Instrument Variable Rate Base Eurocurrency Rate [Member] | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Debt Instrument Variable Rate Base Eurocurrency Rate [Member] Maximum | Sep. 30, 2014 Notes Payable to Banks June 2013 Agreement [Member] Debt Instrument Variable Rate Base Eurocurrency Rate [Member] Minimum [Member] | Sep. 30, 2014 Notes Payable to Banks September 2011 Agreement [Member] | Sep. 30, 2013 Notes Payable to Banks September 2011 Agreement [Member] | Jul. 31, 2010 Senior Notes [Member] | Sep. 30, 2014 Senior Notes [Member] | Sep. 30, 2013 Senior Notes [Member] | Jun. 30, 2013 Senior Notes [Member] | Sep. 30, 2014 Senior Notes [Member] Minimum [Member] item | Jul. 31, 2010 Senior Notes 5.43 Percent Series A Due July 2020 [Member] | Sep. 30, 2014 Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member] | Sep. 30, 2013 Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member] | Jul. 31, 2010 Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member] | Sep. 30, 2014 Line of Credit [Member] | Sep. 30, 2013 Line of Credit [Member] | Jul. 31, 2011 Line of Credit [Member] | Sep. 30, 2014 Line of Credit [Member] Maximum | Sep. 30, 2014 Line of Credit [Member] Minimum [Member] | Sep. 30, 2014 Line of Credit [Member] Base Rate [Member] Maximum | Sep. 30, 2014 Line of Credit [Member] Base Rate [Member] Minimum [Member] | Sep. 30, 2014 Line of Credit [Member] Debt Instrument Variable Rate Base Eurocurrency Rate [Member] Maximum | Sep. 30, 2014 Line of Credit [Member] Debt Instrument Variable Rate Base Eurocurrency Rate [Member] Minimum [Member] | Sep. 30, 2014 Other Debt [Member] | Sep. 30, 2013 Other Debt [Member] | Sep. 30, 2014 Unsecured Credit Facilities [Member] | Sep. 30, 2013 Unsecured Credit Facilities [Member]
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,004,000,000 | $ 1,173,300,000 |  | $ 712,500,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 263,900,000 | $ 260,200,000 |  |  |  |  |  |  | $ 0 | $ 114,700,000 |  |  |  |  |  |  |  | $ 27,600,000 | $ 48,400,000 |  |
Less: Current portion of debt and short-term borrowings | (64,400,000) | (84,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 939,565,000 | 1,089,060,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 64,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 38,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 37,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 263,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 1,004,000,000 | 1,173,300,000 |  | 712,500,000 | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 263,900,000 | 260,200,000 |  |  |  |  |  |  | 0 | 114,700,000 |  |  |  |  |  |  |  | 27,600,000 | 48,400,000 |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  | 175,000,000 |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowings available |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of indebtedness | 1,998,882,000 | 2,156,399,000 | 1,550,996,000 |  |  |  |  |  |  |  |  |  |  |  | 675,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  |  |  |  |  |  | 1.25% | 0.125% |  | 2.25% | 1.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% | 0.125% | 2.25% | 1.125% |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.43% |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Description of interest rate basis |  |  |  |  |  |  |  |  | Base Rate |  |  | Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  | 1.66% |  |  |  |  |  |  |  |  | 1.98% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final principal payment |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.62% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 287,400,000 | 269,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 249,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiary guarantors |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050,000,000 |  |  |  |  |  |  |  |  |  |
Contingent increase to maximum borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000,000 |  |  |  |  |  |  |  |  |  |
Percentage of commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35% | 0.125% |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,100,000 | 35,500,000 |  |  |  |  |  |  |  | 301,000,000 | 236,400,000 |  |
Remaining borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,037,900,000 |  |  |  |  |  |  |  |  |  |  | 327,400,000 | 331,800,000
Actual consolidated leverage ratio | 2.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net worth threshold, base amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net worth threshold, percentage of the consolidated net income for each fiscal quarter commencing with the specified period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net worth of the entity | 2,186,517,000 | 2,021,443,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net worth threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) | 2.80% | 3.00% | 3.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,900,000 | $ 85,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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