Acquisitions and Dispositions - Dispositions Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 21, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss		$ (20,049)	$ (4,153)
Gain on sale of business		$ 0	1,491	$ 0
Mueller-Xingrong [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage	50.50%
Net sales of equity method investment			67,300	121,500
Net loss			(9)	$ 62
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Mueller-Xingrong [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of interest	$ 18,300
Assets	56,800
Carrying value of the liabilities disposed	36,200
Cumulative translation loss	$ 3,800
Gain on sale of business			$ 1,500