QUARTERLY FINANCIAL REPORTING (UNAUDITED) - Summary of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Apr. 04, 2021	Jan. 03, 2021	Oct. 04, 2020	Jun. 30, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 155,532	$ 147,854	$ 118,677	$ 103,745	$ 51,094	$ 102,562	$ 99,628	$ 109,789	$ 525,808	$ 363,073	$ 466,381
Gross profit	37,241	37,227	29,273	26,230	7,407	21,274	21,142	25,533	129,971	75,356	113,127
Goodwill and other intangible asset impairment						56,437				56,437	31,000
Operating income (loss)	23,041	22,563	16,945	13,404	(2,422)	(47,177)	10,335	12,697	75,953	(26,567)	33,259
Net income (loss)	$ 16,534	$ 17,568	$ 12,501	$ 9,567	$ (2,836)	$ (36,713)	$ 6,879	$ 8,623	$ 56,170	$ (24,047)	$ 21,354
Basic earnings (loss) per common share	$ 0.88	$ 0.93	$ 0.66	$ 0.51	$ (0.15)	$ (1.96)	$ 0.37	$ 0.46	$ 2.99	$ (1.28)	$ 1.14
Diluted earnings (loss) per common share	$ 0.87	$ 0.93	$ 0.66	$ 0.51	$ (0.15)	$ (1.96)	$ 0.37	$ 0.46	$ 2.96	$ (1.28)	$ 1.14
Weighted average shares used for computation of:
Basic earnings per common share	18,822,231	18,817,975	18,807,316	18,774,336	18,743,915	18,739,480	18,730,688	18,723,845	18,805,464	18,734,482	18,653,892
Diluted earnings per common share	19,021,220	18,989,629	18,928,408	18,866,826	18,743,915	18,739,480	18,770,783	18,770,756	18,951,521	18,734,482	18,768,207