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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Common Stock Including Additional Paid in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Sep. 29, 2018 18,754,000      
Balance at Sep. 29, 2018 $ 27,340,000 $ (11,994,000) $ 743,745,000 $ 759,091,000
Issuance of common stock upon exercise of stock options (in shares) 128,000      
Issuance of common stock upon exercise of stock options $ 12,658,000 0 0 12,658,000
Issuance of common stock for employee stock purchase plan (in shares) 12,000      
Issuance of common stock for employee stock purchase plan $ 1,516,000 0 0 1,516,000
Foreign currency translation adjustment 0 (909,000) 0 (909,000)
Reclass from accumulated other comprehensive income $ 0 (85,000) 85,000 0
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 91,000 0 0 91,000
Dividends declared 0 0 (37,654,000) (37,654,000)
Share-based compensation 4,139,000 0 0 4,139,000
Net earnings $ 0 0 94,819,000 $ 94,819,000
Repurchase of common stock (in shares)       0
Balance (in shares) at Sep. 28, 2019 18,895,000      
Balance at Sep. 28, 2019 $ 45,744,000 (12,988,000) 800,995,000 $ 833,751,000
Issuance of common stock upon exercise of stock options (in shares) 73,000      
Issuance of common stock upon exercise of stock options $ 6,406,000 0 0 6,406,000
Issuance of common stock for employee stock purchase plan (in shares) 12,000      
Issuance of common stock for employee stock purchase plan $ 1,495,000 0 0 1,495,000
Foreign currency translation adjustment $ 0 (2,599,000) 0 (2,599,000)
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 91,000 0 0 91,000
Dividends declared 0 0 (43,483,000) (43,483,000)
Share-based compensation 4,504,000 0 0 4,504,000
Net earnings $ 0 0 18,305,000 $ 18,305,000
Repurchase of common stock (in shares) (66,000)     (65,648)
Repurchase of common stock $ (8,972,000) 0 0 $ (8,972,292)
Balance (in shares) at Sep. 26, 2020 18,915,000     18,915,000
Balance at Sep. 26, 2020 $ 49,268,000 (15,587,000) 775,817,000 $ 809,498,000
Issuance of common stock upon exercise of stock options (in shares) 158,000      
Issuance of common stock upon exercise of stock options $ 18,739,000 0 0 18,739,000
Issuance of common stock for employee stock purchase plan (in shares) 11,000      
Issuance of common stock for employee stock purchase plan $ 1,391,000 0 0 1,391,000
Foreign currency translation adjustment 0 2,204,000 0 2,204,000
Dividends declared 0 0 (45,984,000) (45,984,000)
Share-based compensation 4,199,000 0 0 4,199,000
Net earnings $ 0 0 55,607,000 $ 55,607,000
Repurchase of common stock (in shares)       0
Balance (in shares) at Sep. 25, 2021 19,084,000     19,084,000
Balance at Sep. 25, 2021 $ 73,597,000 $ (13,383,000) $ 785,440,000 $ 845,654,000