Consolidated Statements of Stockholders' Equity - 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 Jul. 02, 2017	51,227,779	33,901,603				19,989,731
Balance at Jul. 02, 2017	$ 513	$ 339	$ 337,726	$ 32,638	$ (187)	$ (88,790)	$ 282,239
Net income				40,791			40,791
Translation adjustment					(13)		(13)
Conversion of Class B stock into Class A stock (in shares)	78,780
Conversion of Class B stock into Class A stock	$ 1
Conversion of Class B stock into Class A stock (in shares)		(78,780)
Conversion of Class B stock into Class A stock		$ (1)
Stock-based compensation (in shares)	622,734
Stock-based compensation	$ 5		3,721				3,726
Exercise of stock options (in shares)	142,000
Exercise of stock options	$ 1		336				$ 337
Acquisition of Class A treasury stock (in shares)						1,269,059	1,269,059
Acquisition of Class A treasury stock						$ (12,176)	$ (12,176)
Balance (in shares) at Jul. 01, 2018	52,071,293	33,822,823				21,258,790
Balance at Jul. 01, 2018	$ 520	$ 338	341,783	73,429	(200)	$ (100,966)	314,904
Net income				34,766			34,766
Translation adjustment					(69)		(69)
Stock-based compensation (in shares)	411,600
Stock-based compensation	$ 4		6,306				6,310
Exercise of stock options (in shares)	601,234
Exercise of stock options	$ 6		1,230				$ 1,236
Acquisition of Class A treasury stock (in shares)						1,230,303	1,230,303
Acquisition of Class A treasury stock						$ (14,766)	$ (14,766)
Other				330			330
Balance (in shares) at Jun. 30, 2019	53,084,127	33,822,823				22,489,093
Balance at Jun. 30, 2019	$ 530	$ 338	349,319	108,525	(269)	$ (115,732)	342,711
Net income				58,998			58,998
Translation adjustment					26		26
Stock-based compensation (in shares)	470,350
Stock-based compensation	$ 5		8,429				$ 8,434
Exercise of stock options (in shares)	150,000						150,000
Exercise of stock options	$ 2		283				$ 285
Acquisition of Class A treasury stock (in shares)						754,458	754,458
Acquisition of Class A treasury stock						$ (10,680)	$ (10,680)
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