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Debt (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Mar. 31, 2014
Unsecured term credit agreement
Sep. 30, 2013
Unsecured term credit agreement
Mar. 31, 2014
Unsecured term credit agreement
Minimum
item
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Mar. 31, 2013
Unsecured term credit agreement in June 2013
Jun. 30, 2013
Unsecured term credit agreement in June 2013
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Base rate
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Base rate
Maximum
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Base rate
Minimum
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Eurocurrency rate
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Eurocurrency rate
Maximum
Mar. 31, 2014
Unsecured term credit agreement in June 2013
Eurocurrency rate
Minimum
Mar. 31, 2014
Prior term loan facility
Jul. 31, 2010
Unsecured senior notes
Mar. 31, 2014
Unsecured senior notes
Sep. 30, 2013
Unsecured senior notes
Mar. 31, 2014
Unsecured senior notes
Minimum
item
Jul. 31, 2010
5.43% Senior Notes, Series A, due July 2020
Mar. 31, 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
Mar. 31, 2014
Unsecured revolving credit facility
Jan. 31, 2014
Unsecured revolving credit facility
Sep. 30, 2013
Unsecured revolving credit facility
Mar. 31, 2014
Unsecured revolving credit facility
Maximum
Mar. 31, 2014
Unsecured revolving credit facility
Minimum
Mar. 31, 2014
Unsecured revolving credit facility
Base rate
Maximum
Mar. 31, 2014
Unsecured revolving credit facility
Base rate
Minimum
Mar. 31, 2014
Unsecured revolving credit facility
Eurocurrency rate
Maximum
Mar. 31, 2014
Unsecured revolving credit facility
Eurocurrency rate
Minimum
Mar. 31, 2014
Other debt
Sep. 30, 2013
Other debt
Mar. 31, 2014
Unsecured credit facilities
Debt                                                                        
Total debt $ 1,091,200,000   $ 1,173,300,000 $ 750,000,000 $ 750,000,000                         $ 262,000,000 $ 260,200,000           $ 32,800,000   $ 114,700,000             $ 46,400,000 $ 48,400,000  
Less: Current portion of debt and short-term borrowings (82,300,000)   (84,300,000)                                                                  
Long-term debt, less current portion 1,008,891,000   1,089,060,000                                                                  
Scheduled maturities of debt:                                                                        
2014 (six months remaining) 82,000,000                                                                      
2015 38,700,000                                                                      
2016 38,000,000                                                                      
2017 37,700,000                                                                      
2018 600,000,000                                                                      
Thereafter 294,800,000                                                                      
Total debt 1,091,200,000   1,173,300,000 750,000,000 750,000,000                         262,000,000 260,200,000           32,800,000   114,700,000             46,400,000 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 1,141,127,000 1,134,014,000                           675,000,000                                        
Interest rate, basis spread (as a percent)                     1.25% 0.125%   2.25% 1.125%                             1.25% 0.125% 2.25% 1.125%      
Interest rate (as a percent)                                         5.43%     1.00%                        
Description of interest rate basis                   Base Rate     Eurodollar Rate                                              
Average interest rate (as a percent)             1.69% 2.01%                                                        
Final principal payment             600,000,000                                                          
Effective interest rate (as a percent)                                           5.62%                            
Fair value of debt instrument                                   279,100,000 269,400,000                                  
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                                                       0.35% 0.125%              
Outstanding letters of credit                                                 30,900,000   35,500,000             254,200,000 236,400,000  
Remaining borrowing capacity under the credit facility                                                 986,300,000                     337,200,000
Actual consolidated leverage ratio under debt agreements 2.52                                                                      
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 2,100,189,000   2,021,443,000                             2,100,000,000                                    
Net worth threshold                                   1,600,000,000                                    
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) 2.80% 3.00%                                                                    
Total debt                                           $ 87,000,000 $ 85,200,000