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Consolidated Statement of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 27, 2014
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Sep. 29, 2012
Sep. 25, 2011
Balance at, Amount $ 562,518 $ 562,518 $ 516,565 $ 562,518 $ 516,565 $ 475,487 $ 475,487 $ 432,388
Balance at, Shares (in Shares) 18,663,000 18,663,000 18,677,000 18,663,000 18,677,000      
Issuance of common stock upon exercise of stock options, Amount       2,227 2,905 3,332    
Issuance of common stock for employee stock purchase plan, Amount       1,102 1,043 896    
Foreign currency translation adjustment       (929) (571) 782    
Unrealized Holding Loss on Marketable Securities       871 (2,227)      
Issuance of common stock under deferred stock plan, Amount       34 103 687    
Dividends declared       (23,908) (12,010) (9,795)    
Share-based compensation       2,247 1,954 1,246    
Repurchase of common stock, Amount       (7,505) (14,500) (8,167)    
Repurchase of common stock, Shares (in Shares) (17,644)     (81,685) (204,397)   (142,038)  
Net earnings   22,189 20,323 71,814 64,381 54,118 54,118  
Common Stock [Member]
                
Balance at, Amount 32,621 32,621 34,516 32,621 34,516 43,011 43,011 45,017
Balance at, Shares (in Shares) 18,663,000 18,663,000 18,677,000 18,663,000 18,677,000 18,780,000 18,780,000 18,727,000
Issuance of common stock upon exercise of stock options, Amount       2,227 2,905 3,332    
Issuance of common stock upon exercise of stock options, Shares (in Shares)       52,000 80,000 105,000    
Issuance of common stock for employee stock purchase plan, Amount       1,102 1,043 896    
Issuance of common stock for employee stock purchase plan, Shares (in Shares)       16,000 20,000 20,000    
Issuance of common stock under deferred stock plan, Amount       34 103 687    
Issuance of common stock under deferred stock plan, Shares (in Shares)         1,000 70,000    
Share-based compensation       2,247 1,954 1,246    
Repurchase of common stock, Amount       (7,505) (14,500) (8,167)    
Repurchase of common stock, Shares (in Shares)       (82,000) (204,000) (142,000)    
Accumulated Other Comprehensive Income (Loss) [Member]
                
Balance at, Amount (5,988) (5,988) (5,930) (5,988) (5,930) (3,132) (3,132) (3,914)
Foreign currency translation adjustment       (929) (571) 782    
Unrealized Holding Loss on Marketable Securities       871 (2,227)      
Retained Earnings [Member]
                
Balance at, Amount 535,885 535,885 487,979 535,885 487,979 435,608 435,608 391,285
Dividends declared       (23,908) (12,010) (9,795)    
Net earnings       $ 71,814 $ 64,381 $ 54,118