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Consolidated Statement of Changes in Stockholders’ Equity (USD $)
In Thousands, except Share data
Exercise of Stock Options [Member]
Common Stock [Member]
USD ($)
Exercise of Stock Options [Member]
Stockholders' Equity [Member]
USD ($)
Employee Stock Purchase Plan [Member]
Common Stock [Member]
USD ($)
Employee Stock Purchase Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Employee Stock Purchase Plan [Member]
Stockholders' Equity [Member]
USD ($)
Employee Stock Purchase Plan [Member]
Comprehensive Income [Member]
USD ($)
Deferred Stock Plan [Member]
Common Stock [Member]
Deferred Stock Plan [Member]
Stockholders' Equity [Member]
Common Stock [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Stockholders' Equity [Member]
USD ($)
Comprehensive Income [Member]
USD ($)
Total
USD ($)
Balance at Sep. 27, 2008                 $ 48,415 $ (2,003) $ 270,366 $ 316,778    
Balance (in Shares) at Sep. 27, 2008                 18,748,000          
Issuance of common stock upon exercise of stock options 3,284 3,284                        
Issuance of common stock upon exercise of stock options (in Shares) 198,000                          
Issuance of common stock for employee stock purchase plan     687   687                  
Issuance of common stock for employee stock purchase plan (in Shares)     26,000                      
Foreign currency translation adjustment                   (1,428)   (1,428) (1,428)  
Issuance of common stock under deferred stock plan (in Shares)             368,000 368,000            
Issuance of common stock under deferred stock plan (in Shares)             5,000              
Dividends declared                     (7,180) (7,180)    
Share-based compensation                 1,533     1,533    
Repurchase of common stock                 (12,510)     (12,510)    
Repurchase of common stock (in Shares)                 (451,000)          
Net earnings                     41,312 41,312 41,312 41,312
Comprehensive income                         39,884  
Balance at Sep. 26, 2009                 41,777 (3,431) 304,498 342,844    
Balance (in Shares) at Sep. 26, 2009                 18,526,000          
Balance at Sep. 27, 2009                            
Issuance of common stock upon exercise of stock options 2,325 2,325                        
Issuance of common stock upon exercise of stock options (in Shares) 142,000                          
Issuance of common stock for employee stock purchase plan     726   726                  
Issuance of common stock for employee stock purchase plan (in Shares)     22,000                      
Foreign currency translation adjustment       577 577 577                
Issuance of common stock under deferred stock plan (in Shares)             280,000 280,000            
Issuance of common stock under deferred stock plan (in Shares)             5,000              
Dividends declared                     (7,931) (7,931)    
Share-based compensation                 1,113     1,113    
Repurchase of common stock                 (7,768)     (7,768)    
Repurchase of common stock (in Shares)                 (204,000)          
Net earnings                     48,409 48,409 48,409  
Comprehensive income                         48,986  
Balance at Sep. 25, 2010                 38,453 (2,854) 344,976 380,575    
Balance (in Shares) at Sep. 25, 2010                 18,491,000          
Balance at Sep. 26, 2010                            
Issuance of common stock upon exercise of stock options 4,608 4,608                        
Issuance of common stock upon exercise of stock options (in Shares) 214,000                          
Issuance of common stock for employee stock purchase plan     769   769                  
Issuance of common stock for employee stock purchase plan (in Shares)     20,000                      
Foreign currency translation adjustment                   (1,060)   (1,060) (1,060)  
Issuance of common stock to directors                 75     75    
Issuance of common stock to directors (in Shares)                 2,000          
Dividends declared                     (8,754) (8,754)    
Share-based compensation                 1,112     1,112    
Net earnings                     55,063 55,063 55,063  
Comprehensive income                         54,003  
Balance at Sep. 24, 2011                 $ 45,017 $ (3,914) $ 391,285 $ 432,388    
Balance (in Shares) at Sep. 24, 2011                 18,727,000