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Stock-Based Compensation - Outstanding Stock Options (Details) - Stock Options
9 Months Ended
Jun. 30, 2016
$ / shares
shares
Stock-Based Compensation  
Outstanding Number of Shares 428,401
Exercisable Number of Shares 279,453
Exercise Price Per Share $72.93  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 72.93
Remaining Contractual Life 9 months
Outstanding Number of Shares 45,500
Exercisable Number of Shares 45,500
Exercise Price Per Share $54.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 54.00
Remaining Contractual Life 1 year 9 months
Outstanding Number of Shares 55,500
Exercisable Number of Shares 55,500
Exercise Price Per Share $46.83  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 46.83
Remaining Contractual Life 2 years 3 months
Outstanding Number of Shares 20,000
Exercisable Number of Shares 20,000
Exercise Price Per Share $17.82  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 17.82
Remaining Contractual Life 2 years 9 months
Outstanding Number of Shares 12,084
Exercisable Number of Shares 12,084
Exercise Price Per Share $34.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 34.00
Remaining Contractual Life 3 years 6 months
Outstanding Number of Shares 12,400
Exercisable Number of Shares 12,400
Exercise Price Per Share $40.26  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 40.26
Remaining Contractual Life 4 years 5 months 1 day
Outstanding Number of Shares 19,667
Exercisable Number of Shares 19,667
Exercise Price Per Share $55.88  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 55.88
Remaining Contractual Life 5 years 5 months 1 day
Outstanding Number of Shares 19,700
Exercisable Number of Shares 19,700
Exercise Price Per Share $47.96  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 47.96
Remaining Contractual Life 6 years 5 months 1 day
Outstanding Number of Shares 35,600
Exercisable Number of Shares 35,600
Exercise Price Per Share $48.39  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 48.39
Remaining Contractual Life 6 years 5 months 1 day
Outstanding Number of Shares 1,800
Exercisable Number of Shares 1,800
Exercise Price Per Share $52.78  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 52.78
Remaining Contractual Life 7 years 5 months 1 day
Outstanding Number of Shares 45,250
Exercisable Number of Shares 30,168
Exercise Price Per Share $46.72  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 46.72
Remaining Contractual Life 8 years 5 months 1 day
Outstanding Number of Shares 81,100
Exercisable Number of Shares 27,034
Exercise Price Per Share $37.75  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) | $ / shares $ 37.75
Remaining Contractual Life 9 years 5 months 1 day
Outstanding Number of Shares 79,800