Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock Including Additional Paid in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Sep. 28, 2019	18,895,000
Balance at Sep. 28, 2019	$ 45,744	$ (12,988)	$ 800,995	$ 833,751
Issuance of common stock upon exercise of stock options (in shares)	73,000
Issuance of common stock upon exercise of stock options	$ 6,406	0	0	6,406
Issuance of common stock for employee stock purchase plan (in shares)	12,000
Issuance of common stock for employee stock purchase plan	$ 1,495	0	0	1,495
Foreign currency translation adjustment	$ 0	(2,599)	0	(2,599)
Issuance of common stock under deferred stock plan (in shares)	1,000
Issuance of common stock under deferred stock plan	$ 91	0	0	91
Dividends declared	0	0	(43,483)	(43,483)
Share-based compensation	$ 4,504	0	0	$ 4,504
Repurchase of common stock (in shares)	(66,000)			(65,648)
Repurchase of common stock	$ (8,972)	0	0	$ (8,972)
Net earnings	$ 0	0	18,305	18,305
Balance (in shares) at Sep. 26, 2020	18,915,000
Balance at Sep. 26, 2020	$ 49,268	(15,587)	775,817	809,498
Issuance of common stock upon exercise of stock options (in shares)	158,000
Issuance of common stock upon exercise of stock options	$ 18,739	0	0	18,739
Issuance of common stock for employee stock purchase plan (in shares)	11,000
Issuance of common stock for employee stock purchase plan	$ 1,391	0	0	1,391
Foreign currency translation adjustment	0	2,204	0	2,204
Dividends declared	0	0	(45,984)	(45,984)
Share-based compensation	4,199	0	0	$ 4,199
Repurchase of common stock (in shares)				0
Net earnings	$ 0	0	55,607	$ 55,607
Balance (in shares) at Sep. 25, 2021	19,084,000			19,084,000
Balance at Sep. 25, 2021	$ 73,597	(13,383)	785,440	$ 845,654
Issuance of common stock upon exercise of stock options (in shares)	119,000
Issuance of common stock upon exercise of stock options	$ 14,124	0	0	14,124
Issuance of common stock for employee stock purchase plan (in shares)	16,000
Issuance of common stock for employee stock purchase plan	$ 2,036	0	0	2,036
Foreign currency translation adjustment	0	(330)	0	(330)
Dividends declared	0	0	(49,819)	(49,819)
Share-based compensation	4,269	0	0	$ 4,269
Repurchase of common stock (in shares)				0
Net earnings	$ 0	0	47,235	$ 47,235
Balance (in shares) at Sep. 24, 2022	19,219,000			19,219,000
Balance at Sep. 24, 2022	$ 94,026	$ (13,713)	$ 782,856	$ 863,169