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Consolidated Statement 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. 30, 2017 18,663,000      
Balance at Sep. 30, 2017 $ 17,382,000 $ (8,875,000) $ 673,815,000 $ 682,322,000
Issuance of common stock upon exercise of stock options (in shares) 98,000      
Issuance of common stock upon exercise of stock options $ 7,371,000 0 0 7,371,000
Issuance of common stock for employee stock purchase plan (in shares) 13,000      
Issuance of common stock for employee stock purchase plan $ 1,523,000 0 0 1,523,000
Foreign currency translation adjustment 0 (2,738,000) 0 (2,738,000)
Unrealized holding gain on marketable securities $ 0 (381,000) 0 (381,000)
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 97,000 0 0 97,000
Dividends declared 0 0 (33,666,000) (33,666,000)
Share-based compensation $ 3,761,000 0 0 $ 3,761,000
Repurchase of common stock (in shares) (21,000)     20,604
Repurchase of common stock $ (2,794,000) 0 0 $ (2,794,027)
Net earnings $ 0 0 103,596,000 103,596,000
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)
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
Repurchase of common stock (in shares)       0
Net earnings 0 0 94,819,000 $ 94,819,000
Reclass from accumulated other comprehensive gain $ 0 (85,000) 85,000 $ 0
Balance (in shares) at Sep. 28, 2019 18,895,000     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
Repurchase of common stock (in shares) (66,000)     65,648
Repurchase of common stock $ (8,972,000) 0 0 $ (8,972,292)
Net earnings $ 0 0 18,305,000 $ 18,305,000
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