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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Sep. 30, 2008$ 273,050$ 416$ 135,895$ 134,170$ (12)$ 2,581
Beginning balance, shares at Sep. 30, 2008 41,535    
Issuance of Common Stock to 401(k) plan178 178   
Issuance of Common Stock to 401(k) plan, shares 17    
Stock compensation3,701 3,701   
Stock options exercised4,943164,915 12 
Stock options exercised, shares1,528,0481,517    
Issuance of Common Stock due to acquisitions70,7535170,702   
Issuance of Common Stock due to acquisitions, shares5,174,9005,175    
Release of Restricted Stock 4(4)   
Release of Restricted Stock, shares 459    
Excess tax benefit from stock compensation1,789 1,789   
Unrealized gain (loss) on available-for-sale securities      
Foreign currency translation adjustment(7,201)    (7,201)
Net income68,472  68,472  
Total comprehensive income61,271     
Ending balance at Sep. 30, 2009415,685487217,176202,6420(4,620)
Ending balance, shares at Sep. 30, 2009 48,703    
Issuance of Common Stock to 401(k) plan260 260   
Issuance of Common Stock to 401(k) plan, shares 13    
Stock compensation4,512 4,512   
Stock options exercised1,60261,596   
Stock options exercised, shares494,202494    
Issuance of Common Stock due to acquisitions(31) (31)   
Issuance of Common Stock due to acquisitions(31)     
Release of Restricted Stock, shares 16    
Excess tax benefit from stock compensation1,861 1,861   
Unrealized gain (loss) on available-for-sale securities      
Foreign currency translation adjustment(1,755)    (1,755)
Net income97,294  97,294  
Total comprehensive income95,539     
Ending balance at Sep. 30, 2010519,428493225,374299,9360(6,375)
Ending balance, shares at Sep. 30, 2010 49,226    
Issuance of Common Stock to 401(k) plan377 377   
Issuance of Common Stock to 401(k) plan, shares 12    
Stock compensation13,208 13,208   
Stock options exercised3971396   
Stock options exercised, shares62,17362    
Issuance of Common Stock due to acquisitions7,30427,302   
Issuance of Common Stock due to acquisitions, shares208,763209    
Release of Restricted Stock, shares 690    
Excess tax benefit from stock compensation3,23053,225   
Taxes paid related to net share settlement of equity awards(7,484) (7,484)   
Unrealized gain (loss) on available-for-sale securities605    605
Foreign currency translation adjustment5,024    5,024
Net income122,159  122,159  
Total comprehensive income127,788     
Ending balance at Sep. 30, 2011$ 664,248$ 501$ 242,398$ 422,095$ 0$ (746)
Ending balance, shares at Sep. 30, 2011 50,199