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Fair Value of Financial Instruments - Liabilities in Level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Fair value liabilities reconciliation of changes
Fair value of debt	$ 0	$ 72,500
Energy Micro
Fair value liabilities reconciliation of changes
Gain recognized in earnings	(2,700)	(2,700)
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Contingent consideration
Fair value liabilities reconciliation of changes
Balance at the beginning of the period		14,073
Issues	3,829
Settlements		(11,375)
Reclassification to acquisition-related liabilities	(3,380)
Gain recognized in earnings	(449)	$ (2,698)
Convertible Senior Notes
Fair value liabilities reconciliation of changes
Fair value of debt	$ 466,200

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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