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Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Sep. 30, 2009 $ 229,586 $ 284 $ (28,161) $ 181,282 $ 82,708 $ (6,527)
Beginning balance (in shares) at Sep. 30, 2009   28,409 3,708      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 8,941       8,941  
Foreign currency translation adjustment (3,074)         (3,074)
Net unrealized (loss) gain on investments 34         34
Reclassification of (gain) loss into net income (22)         (22)
Total comprehensive income 5,879          
Employee stock purchase issuances 894   943 (49)    
Employee stock purchase issuances (in shares)     (124)      
Issuance of stock upon exercise of stock options 1,672 3   1,669    
Issuance of stock upon exercise of stock options (in shares)   257        
Tax benefit realized upon exercise of stock options (846)     (846)    
Stock-based compensation expense 3,371     3,371    
Ending balance at Sep. 30, 2010 240,556 287 (27,218) 185,427 91,649 (9,589)
Ending balance (in shares) at Sep. 30, 2010   28,666 3,584      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 11,019       11,019  
Foreign currency translation adjustment (770)         (770)
Net unrealized (loss) gain on investments (104)         (104)
Reclassification of (gain) loss into net income 6         6
Total comprehensive income 10,151          
Employee stock purchase issuances 990   852 138    
Employee stock purchase issuances (in shares)     (112)      
Issuance of stock upon exercise of stock options 2,853 4   2,849    
Issuance of stock upon exercise of stock options (in shares)   435        
Tax benefit realized upon exercise of stock options 2,722     2,722    
Stock-based compensation expense 3,444     3,444    
Ending balance at Sep. 30, 2011 260,716 291 (26,366) 194,580 102,668 (10,457)
Ending balance (in shares) at Sep. 30, 2011   29,101 3,472      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 7,615       7,615  
Foreign currency translation adjustment (3,354)         (3,354)
Net unrealized (loss) gain on investments 75         75
Reclassification of (gain) loss into net income 11         11
Total comprehensive income 4,347          
Employee stock purchase issuances 1,041   877 164    
Employee stock purchase issuances (in shares)     (116)      
Issuance of stock upon exercise of stock options 1,072 2   1,070    
Issuance of stock upon exercise of stock options (in shares)   168        
Tax benefit realized upon exercise of stock options (46)     (46)    
Stock-based compensation expense 3,727     3,727    
Ending balance at Sep. 30, 2012 $ 270,857 $ 293 $ (25,489) $ 199,495 $ 110,283 $ (13,725)
Ending balance (in shares) at Sep. 30, 2012   29,269 3,356