SIGNIFICANT ACCOUNTING POLICIES (Revenue, Initial Application Period Cumulative Effect Transition) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	$ 23,753,000				$ 22,161,000				$ 23,753,000	$ 22,161,000	$ 0	$ 11,906,000
Inventories, net	115,020,000				100,431,000				115,020,000	100,431,000	110,315,000	99,105,000
Deferred Tax Assets, Net, Noncurrent					7,840,000					7,840,000	7,882,000	7,715,000
Retained earnings	70,111,000				65,353,000				70,111,000	65,353,000	72,806,000	73,335,000
Revenues	116,018,000	$ 111,455,000	$ 116,722,000	$ 105,285,000	105,581,000	$ 107,954,000	$ 123,037,000	$ 127,472,000	449,480,000	464,044,000	446,322,000
Cost of Goods and Services Sold									414,231,000	429,443,000	412,153,000
Gross profit	8,606,000	9,248,000	8,122,000	9,273,000	8,381,000	6,807,000	9,880,000	9,533,000	35,249,000	34,601,000	34,169,000
Net income (loss)	$ 1,472,000	$ 910,000	$ 824,000	$ 1,552,000	817,000	$ (11,981,000)	$ 1,589,000	$ 1,593,000	$ 4,758,000	(7,982,000)	$ (1,325,000)
Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets					(22,161,000)					(22,161,000)		11,906,000
Inventories, net					19,563,000					19,563,000		(11,210,000)
Deferred Tax Assets, Net, Noncurrent					167,000					167,000		(167,000)
Retained earnings					2,431,000					2,431,000		$ 529,000
Revenues										10,254,000
Cost of Goods and Services Sold										8,353,000
Gross profit										1,901,000
Net income (loss)										1,901,000
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets					0					0
Inventories, net					119,994,000					119,994,000
Deferred Tax Assets, Net, Noncurrent					8,007,000					8,007,000
Retained earnings					$ 62,922,000					62,922,000
Revenues										453,790,000
Cost of Goods and Services Sold										421,090,000
Gross profit										32,700,000
Net income (loss)										$ (9,883,000)