Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 03, 2020	Jun. 30, 2019	Jun. 30, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 1,870	$ 1,336	$ 1,691
Accruals for warranties issued during the period	2,839	2,274	1,318
Settlements made during the period	(1,613)	(1,909)	(1,790)
Ending Balance	$ 3,835	1,870	1,336
Minimum
Product Warranty Liability [Line Items]
Product warranty term	12 months
Maximum
Product Warranty Liability [Line Items]
Product warranty term	36 months
American Panel Corporation
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	$ 739	0	0
Germane Systems, LC
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	0	169	0
Themis
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	$ 0	$ 0	$ 117