Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 22, 2016	Jul. 01, 2018	Apr. 01, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of deferred compensation plan assets		$ 18.1	$ 16.9
Fair value of convertible notes		426.3	422.0
Payments for achievement of certain milestones		0.7
Term B Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt		199.6	199.6
Synkera Technologies, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total purchase price	$ 2.8
Cash paid at closing	1.5
Contingent consideration liability	1.3
Contingent cash consideration (up to)	$ 1.5
Synkera Technologies, Inc. | Measured on a Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability		0.6	1.3
SpectraBeam, LLC | Measured on a Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability		$ 4.1	4.1
Developed technology | SpectraBeam, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability			4.1
Total purchase consideration			17.0
Payments to acquire assets			$ 12.9