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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
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