Acquisitions - Fair Value of Consideration Transferred (Details) - USD ($) $ in Millions	May 31, 2019	Oct. 30, 2018	Jun. 27, 2020	Jun. 29, 2019
Business Acquisition [Line Items]
Fair value of contingent consideration			$ 9.9	$ 38.4
3Z Telecom, Inc.
Business Acquisition [Line Items]
Cash consideration paid at closing	$ 18.9
Escrow payments	4.3
Fair value of contingent consideration	5.5
Total purchase consideration	$ 28.7
RPC Photonics, Inc.
Business Acquisition [Line Items]
Cash consideration paid at closing		$ 29.9
Escrow payments		3.5
Fair value of contingent consideration		36.2	$ 0.0
Total purchase consideration		$ 69.6