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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
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