Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Jun. 28, 2020	53,704,477	33,822,823				23,243,551
Balance at Jun. 28, 2020	$ 537	$ 338	$ 358,031	$ 167,523	$ (243)	$ (126,412)	$ 399,774
Net income	$ 0	$ 0	0	103,915	0	$ 0	103,915
Stock-based compensation (in shares)	643,590	0				0
Stock-based compensation	$ 6	$ 0	5,352	0	0	$ 0	5,358
Exercise of stock options (in shares)	429,200	0				0
Exercise of stock options	$ 4	$ 0	1,028	0	0	$ 0	1,032
Acquisition of Class A treasury stock (in shares)	0	0				546,138
Acquisition of Class A treasury stock	$ 0	$ 0	0	0	0	$ (12,470)	(12,470)
Translation adjustment	$ 0	$ 0	0		(1)	$ 0	(1)
Conversion – Class B into Class A (in shares)	389,209
Conversion – Class B into Class A	$ 4
Conversion – Class B into Class A (in shares)		(389,209)
Conversion – Class B into Class A		$ (4)
Balance (in shares) at Dec. 27, 2020	55,166,476	33,433,614				23,789,689
Balance at Dec. 27, 2020	$ 551	$ 334	364,411	271,438	(244)	$ (138,882)	497,608
Balance (in shares) at Sep. 27, 2020	54,053,730	33,638,614				23,279,906
Balance at Sep. 27, 2020	$ 541	$ 336	360,643	157,761	(243)	$ (127,500)	391,538
Net income	$ 0	$ 0	0	113,677	0	$ 0	113,677
Stock-based compensation (in shares)	554,924	0				0
Stock-based compensation	$ 5	$ 0	2,960	0	0	$ 0	2,965
Exercise of stock options (in shares)	352,822	0				0
Exercise of stock options	$ 3	$ 0	808	0	0	$ 0	811
Acquisition of Class A treasury stock (in shares)	0	0				509,783
Acquisition of Class A treasury stock	$ 0	$ 0	0	0	0	$ (11,382)	(11,382)
Translation adjustment	$ 0	$ 0	0	0	(1)	$ 0	(1)
Conversion – Class B into Class A (in shares)	205,000
Conversion – Class B into Class A	$ 2
Conversion – Class B into Class A (in shares)		(205,000)
Conversion – Class B into Class A		$ (2)
Balance (in shares) at Dec. 27, 2020	55,166,476	33,433,614				23,789,689
Balance at Dec. 27, 2020	$ 551	$ 334	364,411	271,438	(244)	$ (138,882)	497,608
Balance (in shares) at Jun. 27, 2021	55,675,661	33,433,614				24,105,841
Balance at Jun. 27, 2021	$ 557	$ 334	371,103	286,175	(318)	$ (148,781)	509,070
Net income	$ 0	$ 0	0	75,269	0	$ 0	75,269
Stock-based compensation (in shares)	780,721	0				0
Stock-based compensation	$ 8	$ 0	5,288	0	0	$ 0	$ 5,296
Exercise of stock options (in shares)	321,700	0				0	321,700
Exercise of stock options	$ 3	$ 0	843	0	0	$ 0	$ 846
Acquisition of Class A treasury stock (in shares)	0	0				827,307
Acquisition of Class A treasury stock	$ 0	$ 0	0	0	0	$ (25,521)	(25,521)
Balance (in shares) at Dec. 26, 2021	56,778,082	33,433,614				24,933,148
Balance at Dec. 26, 2021	$ 568	$ 334	377,234	361,444	(318)	$ (174,302)	564,960
Balance (in shares) at Sep. 26, 2021	56,098,061	33,433,614				24,393,867
Balance at Sep. 26, 2021	$ 561	$ 334	374,667	272,976	(318)	$ (157,846)	490,374
Net income	$ 0	$ 0	0	88,468	0	$ 0	88,468
Stock-based compensation (in shares)	530,821	0				0
Stock-based compensation	$ 6	$ 0	2,285	0	0	$ 0	2,291
Exercise of stock options (in shares)	149,200	0				0
Exercise of stock options	$ 1	$ 0	282	0	0	$ 0	283
Acquisition of Class A treasury stock (in shares)	0	0				539,281
Acquisition of Class A treasury stock	$ 0	$ 0	0	0	0	$ (16,456)	(16,456)
Balance (in shares) at Dec. 26, 2021	56,778,082	33,433,614				24,933,148
Balance at Dec. 26, 2021	$ 568	$ 334	$ 377,234	$ 361,444	$ (318)	$ (174,302)	$ 564,960