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Consolidated Statement of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Comprehensive Income [Member]
Total
Balance at Sep. 26, 2009 $ 41,777 $ (3,431) $ 304,498   $ 342,844
Balance (in Shares) at Sep. 26, 2009 18,526,000        
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       22,143
Foreign currency translation adjustment   577   577 577
Issuance of common stock under deferred stock plan 280       280
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)       (203,507)
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        
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       19,708
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
Repurchase of common stock (in Shares)         0
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       18,727,000
Issuance of common stock upon exercise of stock options 3,332       3,332
Issuance of common stock upon exercise of stock options (in Shares) 105,000        
Issuance of common stock for employee stock purchase plan 896       896
Issuance of common stock for employee stock purchase plan (in Shares) 20,000       20,318
Foreign currency translation adjustment   782   782 782
Issuance of common stock under deferred stock plan 687       687
Issuance of common stock under deferred stock plan (in Shares) 70,000        
Dividends declared     (9,795)   (9,795)
Share-based compensation 1,246       1,246
Repurchase of common stock (8,167)       (8,167)
Repurchase of common stock (in Shares) (142,000)       (142,038)
Net earnings     54,118 54,118 54,118
Comprehensive income       54,900  
Balance at Sep. 29, 2012 $ 43,011 $ (3,132) $ 435,608   $ 475,487
Balance (in Shares) at Sep. 29, 2012 18,780,000       18,780,000