Business Combinations - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 32,997	$ 34,123	$ 31,580
Net cash paid	3,521	$ 4,805	$ 0
California Environmental & Litho
Business Acquisition [Line Items]
Accounts receivable	67
Inventory	3
Property, plant, & equipment	15
Equipment at customers	0
Intangible assets	445
Goodwill	3
Total purchase price, net of cash acquired	533
Less: working capital adjustment	0
Less: deferred consideration	0
Less: contingent consideration	120
Less: to be placed in escrow	50
Net cash paid	363
All Valley Disposal
Business Acquisition [Line Items]
Accounts receivable	36
Inventory	18
Property, plant, & equipment	252
Equipment at customers	0
Intangible assets	310
Goodwill	384
Total purchase price, net of cash acquired	1,000
Less: working capital adjustment	0
Less: deferred consideration	0
Less: contingent consideration	250
Less: to be placed in escrow	100
Net cash paid	650
GlyEco
Business Acquisition [Line Items]
Accounts receivable	107
Inventory	291
Property, plant, & equipment	746
Equipment at customers	0
Intangible assets	251
Goodwill	251
Total purchase price, net of cash acquired	1,646
Less: working capital adjustment	23
Less: deferred consideration	0
Less: contingent consideration	0
Less: to be placed in escrow	0
Net cash paid	1,623
WSS
Business Acquisition [Line Items]
Accounts receivable	0
Inventory	28
Property, plant, & equipment	154
Equipment at customers	24
Intangible assets	298
Goodwill	0
Total purchase price, net of cash acquired	504
Less: working capital adjustment	14
Less: deferred consideration	0
Less: contingent consideration	40
Less: to be placed in escrow	50
Net cash paid	400
PPI
Business Acquisition [Line Items]
Accounts receivable	909
Inventory	259
Property, plant, & equipment	2,154
Equipment at customers	0
Intangible assets	2,001
Goodwill	406
Total purchase price, net of cash acquired	5,729
Less: working capital adjustment	(62)
Less: deferred consideration	0
Less: contingent consideration	906
Less: to be placed in escrow	0
Net cash paid	4,885
HTSC
Business Acquisition [Line Items]
Accounts receivable	40
Inventory	3
Property, plant, & equipment	47
Equipment at customers	104
Intangible assets	100
Goodwill	377
Total purchase price, net of cash acquired	671
Less: working capital adjustment	(9)
Less: deferred consideration	137
Less: contingent consideration	50
Less: to be placed in escrow	0
Net cash paid	$ 493