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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Mar. 31, 2019 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2018 $ 353,092 $ 27 $ 262,250 $ 166,071 $ (75,256)
Beginning Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267      
Net income $ 10,213     10,213  
Purchase of treasury stock (229)       (229)
Shares issued pursuant to employee stock purchase plan 507   507    
Shares issued pursuant to employee stock purchase plan, Shares   30,650      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   35,000      
Shares issued upon exercise of stock options 1,319   1,319    
Shares issued upon exercise of stock options, Shares   109,275      
Stock-based compensation 3,188   3,188    
Stock-based compensation, Shares   5,035      
Cumulative effect of change in accounting principle - revenue recognition, net of tax 399     399  
Ending Balance at Mar. 31, 2019 $ 368,489 $ 27 $ 267,264 $ 176,683 $ (75,485)
Ending Balance, Shares at Mar. 31, 2019 27,321,227 27,321,227