Restructuring Activities - Other Restructuring Activities (Details) - Restructuring Plan, 2017 $ in Thousands	3 Months Ended
Mar. 30, 2019 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 4,001
Cash Payments	(2,237)
Cumulative Effect of New Accounting Principle in Period of Adoption	(735)
Ending balance	1,029
Restructuring Charges
Restructuring Reserve [Roll Forward]
Beginning balance	3,951
Cash Payments	(2,237)
Cumulative Effect of New Accounting Principle in Period of Adoption	(735)
Ending balance	979
Cost of Sales
Restructuring Reserve [Roll Forward]
Beginning balance	50
Cash Payments	0
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending balance	50
Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance	2,631
Cash Payments	(1,652)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending balance	979
Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance	861
Cash Payments	(126)
Cumulative Effect of New Accounting Principle in Period of Adoption	(735)
Ending balance	0
Professional Service Fees
Restructuring Reserve [Roll Forward]
Beginning balance	43
Cash Payments	(43)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending balance	0
Other restructuring
Restructuring Reserve [Roll Forward]
Beginning balance	416
Cash Payments	(416)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending balance	0
Inventory Reserve
Restructuring Reserve [Roll Forward]
Beginning balance	50
Cash Payments	0
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending balance	$ 50

Restructuring Reserve, Adjustment For Accounting Standards Update

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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