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Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2014
Notes Payable to Banks [Member]
Sep. 30, 2013
Notes Payable to Banks [Member]
Sep. 30, 2014
Notes Payable to Banks [Member]
Minimum [Member]
item
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Jun. 30, 2013
Notes Payable to Banks June 2013 Agreement [Member]
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Base Rate [Member]
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Base Rate [Member]
Maximum
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Base Rate [Member]
Minimum [Member]
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Debt Instrument Variable Rate Base Eurocurrency Rate [Member]
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Debt Instrument Variable Rate Base Eurocurrency Rate [Member]
Maximum
Sep. 30, 2014
Notes Payable to Banks June 2013 Agreement [Member]
Debt Instrument Variable Rate Base Eurocurrency Rate [Member]
Minimum [Member]
Sep. 30, 2014
Notes Payable to Banks September 2011 Agreement [Member]
Sep. 30, 2013
Notes Payable to Banks September 2011 Agreement [Member]
Jul. 31, 2010
Senior Notes [Member]
Sep. 30, 2014
Senior Notes [Member]
Sep. 30, 2013
Senior Notes [Member]
Jun. 30, 2013
Senior Notes [Member]
Sep. 30, 2014
Senior Notes [Member]
Minimum [Member]
item
Jul. 31, 2010
Senior Notes 5.43 Percent Series A Due July 2020 [Member]
Sep. 30, 2014
Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member]
Sep. 30, 2013
Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member]
Jul. 31, 2010
Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member]
Sep. 30, 2014
Line of Credit [Member]
Sep. 30, 2013
Line of Credit [Member]
Jul. 31, 2011
Line of Credit [Member]
Sep. 30, 2014
Line of Credit [Member]
Maximum
Sep. 30, 2014
Line of Credit [Member]
Minimum [Member]
Sep. 30, 2014
Line of Credit [Member]
Base Rate [Member]
Maximum
Sep. 30, 2014
Line of Credit [Member]
Base Rate [Member]
Minimum [Member]
Sep. 30, 2014
Line of Credit [Member]
Debt Instrument Variable Rate Base Eurocurrency Rate [Member]
Maximum
Sep. 30, 2014
Line of Credit [Member]
Debt Instrument Variable Rate Base Eurocurrency Rate [Member]
Minimum [Member]
Sep. 30, 2014
Other Debt [Member]
Sep. 30, 2013
Other Debt [Member]
Sep. 30, 2014
Unsecured Credit Facilities [Member]
Sep. 30, 2013
Unsecured Credit Facilities [Member]
Debt                                                                            
Total debt $ 1,004,000,000 $ 1,173,300,000   $ 712,500,000 $ 750,000,000                         $ 263,900,000 $ 260,200,000             $ 0 $ 114,700,000               $ 27,600,000 $ 48,400,000    
Less: Current portion of debt and short-term borrowings (64,400,000) (84,300,000)                                                                        
Long-term debt, less current portion 939,565,000 1,089,060,000                                                                        
Scheduled maturities of debt:                                                                            
2015 64,400,000                                                                          
2016 38,000,000                                                                          
2017 37,700,000                                                                          
2018 600,000,000                                                                          
Thereafter 263,900,000                                                                          
Total debt 1,004,000,000 1,173,300,000   712,500,000 750,000,000                         263,900,000 260,200,000             0 114,700,000               27,600,000 48,400,000    
Debt agreements                                                                            
Principal amount               750,000,000                 300,000,000         175,000,000     125,000,000                          
Additional borrowings available               100,000,000                                                            
Repayment of indebtedness 1,998,882,000 2,156,399,000 1,550,996,000                       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)             1.66%                 1.98%                                            
Final principal payment             600,000,000                                                              
Effective interest rate (as a percent)                                             5.62%                              
Fair value of debt instrument                                   287,400,000 269,400,000                                      
Proceeds from sale of senior notes                                 249,800,000                                          
Number of subsidiary guarantors           1                             1                                  
Borrowing capacity                                                       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                                                   12,100,000 35,500,000               301,000,000 236,400,000    
Remaining borrowing capacity under the credit facility                                                   1,037,900,000                     327,400,000 331,800,000
Actual consolidated leverage ratio 2.55                                                                          
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 2,186,517,000 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% 3.10%                                                                      
Total debt                                             $ 88,900,000 $ 85,200,000