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Stock Based Compensation Plans (Stock Option Activity Under The Plan) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Number of Shares      
Outstanding at beginning of year 187,050    
Granted 51,295    
Exercised 26,858 26,210  
Forfeited or expired 0    
Outstanding at end of year 211,487   187,050
Vested and expected to vest 211,487    
Exercisable at end of year 160,192    
Weighted Average Exercise Price      
Outstanding at beginning of year $ 13.25    
Granted 40.09    
Exercised 13.25    
Forfeited or expired 0    
Outstanding at end of year 19.76   $ 13.25
Vested and expected to vest 19.76    
Exercisable at end of year $ 13.25    
Weighted Average Remaining Contractual Term      
Outstanding of year 4 years 6 months   0 years
Granted 0 years    
Vested and expected to vest 4 years 6 months    
Exercisable at end of year 2 years 10 months 24 days    
Aggregate Intrinsic Value      
Outstanding at beginning of year $ 0    
Granted 0    
Exercised 0    
Outstanding at end of year 6,983   $ 0
Vested and expected to vest 6,983    
Exercisable at end of year $ 6,332