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Debt (Details) (USD $) | 9 Months Ended |  |  |  | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended |  |  |  |  |  |  |  | 9 Months Ended |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Sep. 30, 2013 | Jun. 30, 2014 Unsecured term credit agreement | Sep. 30, 2013 Unsecured term credit agreement | Jun. 30, 2014 Unsecured term credit agreement Minimum item | Jun. 30, 2014 Unsecured term credit agreement in June 2013 | Jun. 30, 2013 Unsecured term credit agreement in June 2013 | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Base rate | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Base rate Minimum | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Base rate Maximum | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Eurocurrency rate | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Eurocurrency rate Minimum | Jun. 30, 2014 Unsecured term credit agreement in June 2013 Eurocurrency rate Maximum | Jun. 30, 2014 Prior term loan facility | Jul. 31, 2010 Unsecured senior notes | Jun. 30, 2014 Unsecured senior notes | Sep. 30, 2013 Unsecured senior notes | Jun. 30, 2014 Unsecured senior notes Minimum item | Jul. 31, 2010 5.43% Senior Notes, Series A, due July 2020 | Jun. 30, 2014 1.00% Senior Discount Notes, Series B, due July 2022 | Sep. 30, 2013 1.00% Senior Discount Notes, Series B, due July 2022 | Jul. 31, 2010 1.00% Senior Discount Notes, Series B, due July 2022 | Jun. 30, 2014 Unsecured revolving credit facility | Jan. 31, 2014 Unsecured revolving credit facility | Sep. 30, 2013 Unsecured revolving credit facility | Jun. 30, 2014 Unsecured revolving credit facility Minimum | Jun. 30, 2014 Unsecured revolving credit facility Maximum | Jun. 30, 2014 Unsecured revolving credit facility Base rate | Jun. 30, 2014 Unsecured revolving credit facility Base rate Minimum | Jun. 30, 2014 Unsecured revolving credit facility Base rate Maximum | Jun. 30, 2014 Unsecured revolving credit facility Eurocurrency rate | Jun. 30, 2014 Unsecured revolving credit facility Eurocurrency rate Minimum | Jun. 30, 2014 Unsecured revolving credit facility Eurocurrency rate Maximum | Jun. 30, 2014 Other debt | Sep. 30, 2013 Other debt | Jun. 30, 2014 Unsecured credit facilities
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,043,400,000 |  | $ 1,173,300,000 | $ 750,000,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 262,900,000 | $ 260,200,000 |  |  |  |  |  |  |  | $ 114,700,000 |  |  |  |  |  |  |  |  | $ 30,500,000 | $ 48,400,000 |
Less: Current portion of debt and short-term borrowings | (66,500,000) |  | (84,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 976,963,000 |  | 1,089,060,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 (three months remaining) | 66,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 38,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 38,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 37,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 262,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 1,043,400,000 |  | 1,173,300,000 | 750,000,000 | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  | 262,900,000 | 260,200,000 |  |  |  |  |  |  |  | 114,700,000 |  |  |  |  |  |  |  |  | 30,500,000 | 48,400,000 |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  | 300,000,000 |  |  |  | 175,000,000 |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowings available |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of indebtedness | 1,547,557,000 | 1,748,366,000 |  |  |  |  |  |  |  |  |  |  |  |  | 675,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  |  |  |  |  |  | 0.125% | 1.25% |  | 1.125% | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.125% | 1.25% |  | 1.125% | 2.25% |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.43% |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of interest rate basis |  |  |  |  |  |  |  |  | Base Rate |  |  | Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Base Rate |  |  | Eurocurrency 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 282,100,000 | 269,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 249,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiary guarantors |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent increase to maximum borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.125% | 0.35% |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  | 35,500,000 |  |  |  |  |  |  |  |  | 274,800,000 | 236,400,000 |
Remaining borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,040,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | 332,900,000
Actual consolidated leverage ratio under debt agreements | 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio under debt agreements | 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 | 2,197,512,000 |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 87,900,000 | $ 85,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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