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Debt (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2013 Unsecured term credit agreement | Sep. 30, 2012 Unsecured term credit agreement | Sep. 30, 2013 Unsecured term credit agreement in June 2013 | Jun. 30, 2013 Unsecured term credit agreement in June 2013 | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Base rate | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Base rate Maximum | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Base rate Minimum | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate Maximum | Sep. 30, 2013 Unsecured term credit agreement in June 2013 Eurocurrency rate Minimum | Sep. 30, 2013 Prior term loan facility | Sep. 30, 2012 Prior term loan facility | Jul. 31, 2010 Unsecured senior notes | Sep. 30, 2013 Unsecured senior notes | Jun. 30, 2013 Unsecured senior notes | Sep. 30, 2012 Unsecured senior notes | Sep. 30, 2013 Unsecured senior notes Minimum item | Jul. 31, 2010 5.43% Senior Notes, Series A, due July 2020 | Sep. 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 | Sep. 30, 2013 Unsecured revolving credit facility | Sep. 30, 2012 Unsecured revolving credit facility | Jul. 31, 2011 Unsecured revolving credit facility | Sep. 30, 2013 Unsecured revolving credit facility Maximum | Sep. 30, 2013 Unsecured revolving credit facility Minimum | Sep. 30, 2013 Unsecured revolving credit facility Base rate Maximum | Sep. 30, 2013 Unsecured revolving credit facility Base rate Minimum | Sep. 30, 2013 Unsecured revolving credit facility Eurocurrency rate Maximum | Sep. 30, 2013 Unsecured revolving credit facility Eurocurrency rate Minimum | Sep. 30, 2013 Notes secured by real properties | Sep. 30, 2012 Notes secured by real properties | Sep. 30, 2013 Other debt | Sep. 30, 2012 Other debt | Sep. 30, 2013 Unsecured credit facilities | Sep. 30, 2012 Unsecured credit facilities
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,173,300,000 | $ 1,069,700,000 |  | $ 750,000,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 260,200,000 |  | $ 256,800,000 |  |  |  |  |  | $ 114,700,000 | $ 24,000,000 |  |  |  |  |  |  |  |  | $ 24,200,000 | $ 48,400,000 | $ 14,700,000 |  |
Less: Current portion of debt and short-term borrowings | (84,300,000) | (162,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 1,089,060,000 | 907,141,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 84,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 38,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 152,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 37,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 260,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 1,173,300,000 | 1,069,700,000 |  | 750,000,000 | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  | 260,200,000 |  | 256,800,000 |  |  |  |  |  | 114,700,000 | 24,000,000 |  |  |  |  |  |  |  |  | 24,200,000 | 48,400,000 | 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) |  |  |  |  |  | 1.98% |  |  |  |  |  |  |  |  | 2.19% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final principal payment |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.62% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269,400,000 |  | 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 |  |  |  |  |  |  |  |  |  | 236,400,000 | 209,800,000 |  |
Remaining borrowing capacity under the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 899,800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 331,800,000 | 255,500,000
Outstanding under unsecured credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 4,800,000
Actual consolidated leverage ratio | 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 2,021,443,000 | 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% | 3.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,200,000 | $ 81,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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