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Fair Value Measurements - Narrative (Details) - USD ($)			3 Months Ended
	Oct. 01, 2018	Apr. 01, 2018	Sep. 28, 2018	Mar. 30, 2018	Dec. 31, 2017	Jun. 08, 2015
Debt Instrument [Line Items]
Cost method investments, fair value			$ 7,400,000		$ 12,600,000
Incremental ownership share of AFSM (as a percent)		30.00%
Purchase price of production facility		$ 19,800,000
Ownership interest in AFSM following transaction		40.00%
Aggregate investment in production facility		$ 26,200,000
Required increase in ownership percentage, period of nine and eighteen months		100.00%
1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)			1.00%
Convertible Debt | 1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)			1.00%			1.00%
Convertible Debt | 1.625% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)			1.625%
AXSEM
Debt Instrument [Line Items]
Contingent consideration relating to the second earn-out				$ 0
Purchase Of Inventory | Affiliated Entity
Debt Instrument [Line Items]
Inventory purchased from related party			$ 22,600,000
Payable to AFSM			$ 21,100,000
Subsequent Event | AFSM
Debt Instrument [Line Items]
Additional voting interest acquired	20.00%
Additional purchase price of production facility	$ 12,300,000
Ownership interest following acquisition	60.00%
Aggregate investment in AFSM	$ 40,900,000

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