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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
Common Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Sep. 27, 2014 18,663,000      
Balance at Sep. 27, 2014 $ 32,621,000 $ (5,988,000) $ 535,885,000 $ 562,518,000
Issuance of common stock upon exercise of stock options (in shares) 72,000      
Issuance of common stock upon exercise of stock options $ 3,489,000 3,489,000
Issuance of common stock for employee stock purchase plan (in shares) 14,000      
Issuance of common stock for employee stock purchase plan $ 1,174,000 1,174,000
Foreign currency translation adjustment (5,389,000) (5,389,000)
Unrealized holding gain on marketable securities 480,000 480,000
Issuance of common stock under deferred stock plan (in shares)      
Issuance of common stock under deferred stock plan $ 21,000 21,000
Dividends declared (26,905,000) (26,905,000)
Share-based compensation $ 2,359,000 $ 2,359,000
Repurchase of common stock (in shares) (73,000)     (72,698)
Repurchase of common stock $ (8,011,000) $ (8,011,118)
Net earnings 70,183,000 70,183,000
Balance (in shares) at Sep. 26, 2015 18,676,000      
Balance at Sep. 26, 2015 $ 31,653,000 (10,897,000) 579,163,000 599,919,000
Issuance of common stock upon exercise of stock options (in shares) 120,000      
Issuance of common stock upon exercise of stock options $ 5,249,000 5,249,000
Issuance of common stock for employee stock purchase plan (in shares) 14,000      
Issuance of common stock for employee stock purchase plan $ 1,320,000 1,320,000
Foreign currency translation adjustment (3,065,000) (3,065,000)
Unrealized holding gain on marketable securities 547,000 547,000
Issuance of common stock under deferred stock plan (in shares)      
Issuance of common stock under deferred stock plan $ 7,000 7,000
Dividends declared (29,081,000) (29,081,000)
Share-based compensation $ 2,368,000 $ 2,368,000
Repurchase of common stock (in shares) (142,000)     (141,700)
Repurchase of common stock $ (15,265,000) $ (15,265,019)
Net earnings 75,975,000 $ 75,975,000
Balance (in shares) at Sep. 24, 2016 18,668,000     18,668,000
Balance at Sep. 24, 2016 $ 25,332,000 (13,415,000) 626,057,000 $ 637,974,000
Issuance of common stock upon exercise of stock options (in shares) 124,000      
Issuance of common stock upon exercise of stock options $ 5,826,000 5,826,000
Issuance of common stock for employee stock purchase plan (in shares) 13,000      
Issuance of common stock for employee stock purchase plan $ 1,405,000 1,405,000
Foreign currency translation adjustment 3,745,000 3,745,000
Unrealized holding gain on marketable securities 795,000 795,000
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 94,000 94,000
Dividends declared (31,416,000) (31,416,000)
Share-based compensation $ 2,954,000 $ 2,954,000
Repurchase of common stock (in shares) (143,000)     (142,665)
Repurchase of common stock $ (18,229,000) $ (18,228,763)
Net earnings 79,174,000 $ 79,174,000
Balance (in shares) at Sep. 30, 2017 18,663,000     18,663,000
Balance at Sep. 30, 2017 $ 17,382,000 $ (8,875,000) $ 673,815,000 $ 682,322,000