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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Common-stock based award plan    
Compensation expense (in dollars) $ 7,921 $ 6,982
Stock options    
Common-stock based award plan    
The period from the grant date after which options expire 10 years  
Compensation expense (in dollars) $ 3,550 $ 3,062
Weighted-average assumptions utilized in determining the fair value of options    
Risk-free interest rate (as a percent) 1.80% 1.70%
Expected stock volatility (as a percent) 37.60% 37.00%
Dividend yield (as a percent) 4.60% 3.90%
Expected term 5 years 6 months 5 years 6 months
Options    
Options outstanding at the beginning of the period (in shares) 2,776,000  
Granted (in shares) 876,379  
Exercised (in shares) (119,000)  
Forfeited/Expired (in shares) (2,000)  
Option outstanding at the end of the period (in shares) 3,531,000  
Vested and expected to vest at the end of the period (in shares) 3,495,000  
Exercisable at the end of the period (in shares) 2,331,000  
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 48.51  
Granted (in dollars per share) 58.25  
Exercised (in dollars per share) 31.19  
Forfeited/Expired (in dollars per share) 54.65  
Outstanding at the end of the period (in dollars per share) 51.51  
Vested and expected to vest at the end of the period (in dollars per share) 51.39  
Exercisable at the end of the period (in dollars per share) $ 46.06  
Weighted- Average Remaining Contractual Term    
Outstanding at the end of the period 6 years 4 months 24 days  
Vested and expected to vest at the end of the period 6 years 4 months 24 days  
Exercisable at the end of the period 4 years 10 months 24 days  
Aggregate Intrinsic Value    
Outstanding at the end of the period (in dollars) $ 26,600  
Vested and expected to vest at the end of the period (in dollars) 26,700  
Exercisable at the end of the period (in dollars) $ 26,600  
Weighted-average fair value of options granted (in dollars per share) $ 13.12  
Total intrinsic value of options exercised (in dollars) $ 3,100  
Unrecognized compensation cost (in dollars) $ 12,700  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 3 years 4 months 24 days  
Restricted stock    
Common-stock based award plan    
Compensation expense (in dollars) $ 4,371 $ 3,920
Options    
Granted (in shares) 294,000  
Aggregate Intrinsic Value    
Unrecognized compensation cost (in dollars) $ 33,100  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 10 months 24 days  
Restricted stock awards activity, shares    
Unvested at the beginning of the period (in shares) 668,000  
Granted (in shares) 294,575  
Vested (in shares) (256,000)  
Forfeited/Expired (in shares) (3,000)  
Unvested at the end of the period (in shares) 703,000  
Restricted stock awards activity, weighted average grant date fair value    
Unvested at the beginning of the period (in dollars per share) $ 67.03  
Granted (in dollars per share) 58.25  
Vested (in dollars per share) 64.75  
Forfeited/Expired (in dollars per share) 68.57  
Unvested at the end of the period (in dollars per share) $ 64.17  
Restricted stock | Minimum    
Common-stock based award plan    
Vesting period 3 years  
Restricted stock | Maximum    
Common-stock based award plan    
Vesting period 6 years