Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 30, 2018	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability		$ 9.9	$ 38.4
Net change in fair value of contingent liabilities		(31.5)	(5.9)	$ 0.0
RPC Photonics, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, up to	$ 53.0
Contingent consideration period	4 years
Contingent consideration liability	$ 36.2	0.0
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net change in fair value of contingent liabilities		31.5	5.9
Remeasurement of fair value		9.9	38.4	0.0
Contingent Consideration | RPC Photonics, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net change in fair value of contingent liabilities		29.6	5.9
Earn-out payment		0.7
Remeasurement of fair value		$ 0.0	$ 30.3	$ 0.0