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Stock-Based Compensation (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
The Purchase Plan
Sep. 30, 2012
The Purchase Plan
Sep. 30, 2011
The Purchase Plan
Jan. 25, 2010
The Purchase Plan
Sep. 30, 2013
Stock Options
Sep. 30, 2013
Restricted Stock Units
Sep. 30, 2013
The Stock Option Plan and Non-Officer Plan
Sep. 30, 2013
The Incentive Plan
Jan. 28, 2013
The Incentive Plan
Jan. 25, 2010
The Omnibus Plan
Dec. 04, 2009
The Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period                   4 years        
Expiration period                   10 years        
Number of shares authorized                       1,750,000   5,750,000
Number of shares available for future grants                     1,500,000      
Number of additional shares authorized                         2,500,000  
Proceeds from stock option plan transactions $ 2,193,000 $ 1,072,000 $ 2,853,000                      
Excess tax benefits from stock-based compensation (67,000) (198,000) (796,000)                      
Number of continuous days of service       90 days                    
Number of hours per week employed       20 hours                    
Discount from market price       85.00%                    
Offering period       3 months                    
Number of additional shares authorized             250,000              
Number of shares authorized             2,000,000              
Employee contributions       1,000,000 1,000,000 1,000,000                
Common shares issued to employees       128,853 115,477 112,285                
Shares available for future issuance       70,827                    
Total intrinsic value of all options exercised 500,000 700,000 2,400,000                      
Forfeiture rate 2.00%                          
Total unrecognized compensation cost nonvested awards               6,000,000            
Total grant date fair value of shares vested 3,100,000 3,000,000 3,700,000                      
Weighted average period, unrecognized compensation cost, nonvested awards               2 years 6 months 3 days 0 years 11 months 4 days          
Total unrecognized compensation cost, restricted stock units $ 300,000