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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Earnings [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2016 $ 312,473 $ 26 $ 241,058   $ 103,212 $ (31,823)
Beginning Balance, Shares at Sep. 30, 2016   25,977,632        
Net income 23,547       23,547  
Purchase of treasury stock (42,738)         (42,738)
Shares issued pursuant to employee stock purchase plan 887   887      
Shares issued pursuant to employee stock purchase plan, Shares   51,697        
Shares issued upon vesting of equity awards, net of minimum tax withholding (479)   (479)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   56,539        
Shares issued upon exercise of stock options 2,271   2,271      
Shares issued upon exercise of stock options, Shares   184,931        
Stock-based compensation 6,237   6,237      
Stock-based compensation, Shares   43,267        
Ending Balance at Sep. 30, 2017 302,198 $ 26 249,974   126,759 (74,561)
Ending Balance, Shares at Sep. 30, 2017   26,314,066        
Net income 39,312       39,312  
Purchase of treasury stock (695)         (695)
Shares issued pursuant to employee stock purchase plan 950   950      
Shares issued pursuant to employee stock purchase plan, Shares   67,187        
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,643)   (1,643)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   163,350        
Shares issued upon exercise of stock options 6,733 $ 1 6,732      
Shares issued upon exercise of stock options, Shares   586,531        
Stock-based compensation 6,237   6,237      
Stock-based compensation, Shares   10,133        
Ending Balance at Sep. 30, 2018 $ 353,092 $ 27 262,250   166,071 (75,256)
Ending Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267        
Net income $ 35,985       35,985  
Purchase of treasury stock (27,708)         (27,708)
Shares issued pursuant to employee stock purchase plan 1,022   1,022      
Shares issued pursuant to employee stock purchase plan, Shares   62,287        
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,216)   (1,216)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   174,606        
Shares issued upon exercise of stock options 1,390 $ 1 1,389      
Shares issued upon exercise of stock options, Shares   119,275        
Stock-based compensation 6,524   6,524      
Stock-based compensation, Shares   11,038        
Foreign currency translation adjustments (669)     $ (669)    
Cumulative effect of change in accounting principle - revenue recognition, net of tax 399       399  
Ending Balance at Sep. 30, 2019 $ 368,819 $ 28 $ 269,969 $ (669) $ 202,455 $ (102,964)
Ending Balance, Shares at Sep. 30, 2019 27,508,473 27,508,473