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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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