Revenue (Tables)

12 Months Ended

Dec. 28, 2019

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue by Major Lines

The following table disaggregates our revenue by major lines:

	For the Fiscal Year Ended, December 28, 2019						For the Fiscal Year Ended, December 29, 2018
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Total		Environmental Services		Oil Business		Total
Parts cleaning, containerized waste, & related products/services	$	168,521	$	—	$	168,521	$	178,607	$	—	$	178,607
Vacuum Services & Wastewater Treatment	60,736		—		60,736		53,934		—		53,934
Antifreeze Business	27,321		—		27,321		19,021		—		19,021
Field Services	21,701		—		21,701		17,692		—		17,692
Environmental Services - Other	1,856		—		1,856		1,877		—		1,877
Re-refinery Product Sales	—		115,551		115,551		—		112,472		112,472
Oil Collection Services & RFO	—		21,445		21,445		—		21,405		21,405
Oil Filter Business	—		4,633		4,633		—		4,838		4,838
Revenues from Contracts with Customers	280,135		141,629		421,764		271,131		138,715		409,846
Other Revenue	22,408		255		22,663		—		337		337
Total Revenues	$	302,543	$	141,884	$	444,427	$	271,131	$	139,052	$	410,183

Contract Assets and Contract Liabilities from Contracts with Customers

The following table provides information about contract assets and contract liabilities from contracts with customers:

(thousands)	December 28, 2019		December 29, 2018
Contract assets	$	64	$	100
Contract liabilities	2,316		266
Contract liabilities - net	$	2,252	$	166