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Stock Based Compensation Plans (Stock Option Activity Under The Plan) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Shares    
Outstanding at beginning of period 150,033  
Granted 2,400  
Exercised (10,500) (8,400)
Forfeited or expired (450)  
Outstanding at end of period 141,483  
Vested and expected to vest 141,483  
Exercisable at end of period 101,856  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 24.88  
Granted 59.23  
Exercised 14.53  
Forfeited or expired 40.09  
Outstanding at end of period 26.18  
Vested and expected to vest 26.18  
Exercisable at end of period $ 18.57  
Weighted Average Remaining Contractual Term    
Outstanding of period 4 years 2 months 12 days  
Vested and expected to vest 4 years 2 months 12 days  
Exercisable at end of period 2 years 8 months 12 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 3,758  
Vested and expected to vest 3,758  
Exercisable at end of period $ 3,402