Fair Value Measurements - Narrative (Details) - USD ($)			1 Months Ended	3 Months Ended
	May 31, 2019	Oct. 30, 2018	May 31, 2019	Oct. 03, 2020	Sep. 28, 2019	Jun. 27, 2020	Jun. 29, 2019
Business Acquisition [Line Items]
Contingent consideration liability				$ 9,900,000		$ 9,900,000	$ 9,900,000
Payment for contingent earn-out liability				$ 0	$ 0
3Z Telecom, Inc.
Business Acquisition [Line Items]
Cash consideration paid at closing			$ 23,200,000
Earn-out liability	$ 7,000,000.0		$ 7,000,000.0
Earn-out liability period	2 years
RPC Photonics, Inc.
Business Acquisition [Line Items]
Cash consideration paid at closing		$ 33,400,000
Earn-out liability		$ 53,000,000.0
Earn-out liability period		4 years