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Debt (Details) (USD $) | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2012 | Jun. 30, 2013 Unsecured term credit agreement | Sep. 30, 2012 Unsecured term credit agreement | Jun. 30, 2013 Unsecured term credit agreement in June 2013 | Jun. 30, 2012 Unsecured term credit agreement in June 2013 | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Base rate | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Base rate Maximum | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Base rate Minimum | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate Maximum | Jun. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate Minimum | Jun. 30, 2013 Prior term loan facility | Jul. 31, 2010 Unsecured senior notes | Jun. 30, 2013 Unsecured senior notes | Sep. 30, 2012 Unsecured senior notes | Jun. 30, 2013 Unsecured senior notes Minimum item | Jul. 31, 2010 5.43% Senior Notes, Series A, due July 2020 | Jun. 30, 2013 1.00% Senior Discount Notes, Series B, due July 2022 | Sep. 30, 2012 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, 2013 Unsecured revolving credit facility | Sep. 30, 2012 Unsecured revolving credit facility | Jul. 31, 2011 Unsecured revolving credit facility | Jun. 30, 2013 Unsecured revolving credit facility Maximum | Jun. 30, 2013 Unsecured revolving credit facility Minimum | Jun. 30, 2013 Unsecured revolving credit facility Base rate Maximum | Jun. 30, 2013 Unsecured revolving credit facility Base rate Minimum | Jun. 30, 2013 Unsecured revolving credit facility Eurocurrency rate Maximum | Jun. 30, 2013 Unsecured revolving credit facility Eurocurrency rate Minimum | Jun. 30, 2013 Notes secured by real properties | Sep. 30, 2012 Notes secured by real properties | Jun. 30, 2013 Other debt | Sep. 30, 2012 Other debt | Jun. 30, 2013 Unsecured credit facilities | Sep. 30, 2012 Unsecured credit facilities
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,148,700,000 |  | $ 1,069,700,000 | $ 750,000,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  | $ 259,300,000 | $ 256,800,000 |  |  |  |  |  | $ 108,000,000 | $ 24,000,000 |  |  |  |  |  |  |  |  | $ 24,200,000 | $ 31,400,000 | $ 14,700,000 |  |
Less: Current portion of debt and short-term borrowings | (13,500,000) |  | (162,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 1,135,226,000 |  | 907,141,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 (three months remaining) | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 54,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 38,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 146,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 37,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 859,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 1,148,700,000 |  | 1,069,700,000 | 750,000,000 | 750,000,000 |  |  |  |  |  |  |  |  |  |  | 259,300,000 | 256,800,000 |  |  |  |  |  | 108,000,000 | 24,000,000 |  |  |  |  |  |  |  |  | 24,200,000 | 31,400,000 | 14,700,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 675,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  |  |  |  |  | 1.25% | 0.125% |  | 2.25% | 1.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 0.00% | 2.50% | 1.00% |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.43% |  |  | 1.00% |  |  |  |  |  |  |  |  |  | 6.04% |  |  |  |  |
Description of interest rate basis |  |  |  |  |  |  |  | Base Rate |  |  | Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  | 2.00% | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final principal payment |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.62% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 266,200,000 | 277,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 249,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiary guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent increase to maximum borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% | 0.15% |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,500,000 | 35,100,000 |  |  |  |  |  |  |  |  |  | 234,600,000 | 209,800,000 |  |
Remaining borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 906,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | 245,100,000 |
Outstanding under unsecured credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 4,800,000
Actual consolidated leverage ratio | 2.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 1,985,730,000 |  | 2,169,464,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net worth threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) | 3.00% | 3.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84,300,000 | $ 81,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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