Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 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. 25, 2021	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)	5,000
Issuance of common stock upon exercise of stock options	$ 706	0	0	706
Foreign currency translation adjustment	0	(444)	0	(444)
Dividends declared	0	0	(12,092)	(12,092)
Share-based compensation	1,083	0	0	1,083
Net earnings	$ 0	0	11,091	11,091
Balance (in shares) at Dec. 25, 2021	19,089,000
Balance at Dec. 25, 2021	$ 75,386	(13,827)	784,439	845,998
Balance (in shares) at Sep. 25, 2021	19,084,000
Balance at Sep. 25, 2021	$ 73,597	(13,383)	785,440	845,654
Foreign currency translation adjustment				9
Net earnings				29,925
Balance (in shares) at Jun. 25, 2022	19,184,000
Balance at Jun. 25, 2022	$ 90,274	(13,374)	778,999	855,899
Balance (in shares) at Dec. 25, 2021	19,089,000
Balance at Dec. 25, 2021	$ 75,386	(13,827)	784,439	845,998
Issuance of common stock upon exercise of stock options (in shares)	76,000
Issuance of common stock upon exercise of stock options	$ 10,012	0	0	10,012
Foreign currency translation adjustment	0	546	0	546
Dividends declared	0	0	(12,136)	(12,136)
Share-based compensation	1,267	0	0	1,267
Net earnings	$ 0	0	3,271	3,271
Issuance of common stock for employee stock purchase plan (in shares)	8,000
Issuance of common stock for employee stock purchase plan	$ 1,023	0	0	1,023
Balance (in shares) at Mar. 26, 2022	19,173,000
Balance at Mar. 26, 2022	$ 87,688	(13,281)	775,574	849,981
Issuance of common stock upon exercise of stock options (in shares)	11,000
Issuance of common stock upon exercise of stock options	$ 1,452	0	0	1,452
Foreign currency translation adjustment	0	(93)	0	(93)
Dividends declared	0	0	(12,138)	(12,138)
Share-based compensation	1,134	0	0	1,134
Net earnings	$ 0	0	15,563	15,563
Issuance of common stock for employee stock purchase plan (in shares)	0
Issuance of common stock for employee stock purchase plan	$ 0	0	0	0
Balance (in shares) at Jun. 25, 2022	19,184,000
Balance at Jun. 25, 2022	$ 90,274	(13,374)	778,999	$ 855,899
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
Issuance of common stock upon exercise of stock options (in shares)	10,000
Issuance of common stock upon exercise of stock options	$ 1,285	0	0	1,285
Foreign currency translation adjustment	0	871	0	871
Dividends declared	0	0	(13,461)	(13,461)
Share-based compensation	1,239	0	0	1,239
Net earnings	$ 0	0	6,633	6,633
Balance (in shares) at Dec. 24, 2022	19,229,000
Balance at Dec. 24, 2022	$ 96,550	(12,842)	776,028	$ 859,736
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
Foreign currency translation adjustment				4,714
Net earnings				$ 48,485
Balance (in shares) at Jun. 24, 2023	19,270,000			19,270,000
Balance at Jun. 24, 2023	$ 104,250	(8,999)	790,916	$ 886,167
Balance (in shares) at Dec. 24, 2022	19,229,000
Balance at Dec. 24, 2022	$ 96,550	(12,842)	776,028	859,736
Issuance of common stock upon exercise of stock options (in shares)	14,000
Issuance of common stock upon exercise of stock options	$ 1,713	0	0	1,713
Foreign currency translation adjustment	0	1,068	0	1,068
Dividends declared	0	0	(13,475)	(13,475)
Share-based compensation	1,313	0	0	1,313
Net earnings	$ 0	0	6,871	6,871
Issuance of common stock for employee stock purchase plan (in shares)	9,000
Issuance of common stock for employee stock purchase plan	$ 1,061	0	0	1,061
Balance (in shares) at Mar. 25, 2023	19,252,000
Balance at Mar. 25, 2023	$ 100,637	(11,774)	769,424	858,287
Issuance of common stock upon exercise of stock options (in shares)	18,000
Issuance of common stock upon exercise of stock options	$ 2,230	0	0	2,230
Foreign currency translation adjustment	0		0	2,775
Dividends declared	0		(13,489)	(13,489)
Share-based compensation	1,383	0	0	1,383
Net earnings	$ 0	0	34,981	34,981
Issuance of common stock for employee stock purchase plan (in shares)	0
Issuance of common stock for employee stock purchase plan	$ 0	0	0	$ 0
Balance (in shares) at Jun. 24, 2023	19,270,000			19,270,000
Balance at Jun. 24, 2023	$ 104,250	$ (8,999)	$ 790,916	$ 886,167