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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2014 $ 265,298 $ 307 $ (53,237) $ 218,689 $ 117,816 $ (18,277)
Beginning balance (in shares) at Sep. 30, 2014   30,704 6,314      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 6,588       6,588  
Other comprehensive income (loss) (4,336)         (4,336)
Employee stock purchase issuances (in shares)     (124)      
Employee stock purchase issuances 925   $ 1,041 (116)    
Repurchase of common stock (in shares)     297      
Repurchase of common stock (2,339)   $ (2,339)      
Issuance of stock under stock award plans (in shares)   830        
Issuance of stock under stock award plans 6,559 $ 8   6,551    
Tax impact from equity awards (2,058)     (2,058)    
Stock-based compensation expense 4,301     4,301    
Ending balance (in shares) at Sep. 30, 2015   31,534 6,487      
Ending balance at Sep. 30, 2015 274,938 $ 315 $ (54,535) 227,367 124,404 (22,613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 16,708       16,708  
Other comprehensive income (loss) (2,078)         (2,078)
Employee stock purchase issuances (in shares)     (104)      
Employee stock purchase issuances 896   $ 876 20    
Repurchase of common stock (in shares)     48      
Repurchase of common stock (550)   $ (550)      
Issuance of stock under stock award plans (in shares)   937        
Issuance of stock under stock award plans 7,191 $ 10   7,181    
Tax impact from equity awards (914)     (914)    
Accelerated vesting of Etherios stock award plans 184     184    
Stock-based compensation expense 3,654     3,654    
Ending balance (in shares) at Sep. 30, 2016   32,471 6,431      
Ending balance at Sep. 30, 2016 300,029 $ 325 $ (54,209) 237,492 141,112 (24,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 9,366       9,366  
Other comprehensive income (loss) 2,032         2,032
Employee stock purchase issuances (in shares)     (72)      
Employee stock purchase issuances 685   $ 614 71    
Repurchase of common stock (in shares)     78      
Repurchase of common stock (938)   $ (938)      
Issuance of stock under stock award plans (in shares)   537        
Issuance of stock under stock award plans 3,502 $ 5   3,497    
Tax impact from equity awards (191)     (191)    
Stock-based compensation expense 4,659     4,659    
Ending balance (in shares) at Sep. 30, 2017   33,008 6,437      
Ending balance at Sep. 30, 2017 $ 319,144 $ 330 $ (54,533) $ 245,528 $ 150,478 $ (22,659)