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Stock-Based Compensation (Details 3) - Employee and Directors Stock Options
12 Months Ended
Sep. 30, 2015
$ / shares
shares
Stock-Based Compensation  
Outstanding Number of Shares 358,601
Exercisable Number of Shares 234,867
Exercise Price Dollar 31.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 31.00
Remaining Contractual Life 6 months
Outstanding Number of Shares 10,000
Exercisable Number of Shares 10,000
Exercise Price Dollar 72.93  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 72.93
Remaining Contractual Life 1 year 6 months
Outstanding Number of Shares 45,500
Exercisable Number of Shares 45,500
Exercise Price Dollar 54.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 54.00
Remaining Contractual Life 2 years 6 months
Outstanding Number of Shares 55,500
Exercisable Number of Shares 55,500
Exercise Price Dollar 46.83  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 46.83
Remaining Contractual Life 3 years
Outstanding Number of Shares 20,000
Exercisable Number of Shares 20,000
Exercise Price Dollar 17.82  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 17.82
Remaining Contractual Life 3 years 6 months
Outstanding Number of Shares 12,084
Exercisable Number of Shares 12,084
Exercise Price Dollar 34.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 34.00
Remaining Contractual Life 4 years 3 months
Outstanding Number of Shares 12,400
Exercisable Number of Shares 12,400
Exercise Price Dollar 40.26  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 40.26
Remaining Contractual Life 5 years 2 months 1 day
Outstanding Number of Shares 19,667
Exercisable Number of Shares 19,667
Exercise Price Dollar 55.88  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 55.88
Remaining Contractual Life 6 years 2 months 1 day
Outstanding Number of Shares 19,700
Exercisable Number of Shares 19,700
Exercise Price Dollar 47.96  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 47.96
Remaining Contractual Life 7 years 2 months 1 day
Outstanding Number of Shares 35,600
Exercisable Number of Shares 23,734
Exercise Price Dollar 48.39  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 48.39
Remaining Contractual Life 7 years 2 months 1 day
Outstanding Number of Shares 1,800
Exercisable Number of Shares 1,200
Exercise Price Dollar 52.78  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 52.78
Remaining Contractual Life 8 years 2 months 1 day
Outstanding Number of Shares 45,250
Exercisable Number of Shares 15,082
Exercise Price Per Share $46.72  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 46.72
Remaining Contractual Life 9 years 2 months 1 day
Outstanding Number of Shares 81,100