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Debt (Details) (USD $)
 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
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