Business Combinations - Assets and Liabilities Acquired (Details) - USD ($)		8 Months Ended
	Mar. 24, 2016	Sep. 10, 2016	Sep. 12, 2015	Jan. 02, 2016
Business Acquisition [Line Items]
Goodwill		$ 31,510,000		$ 30,325,000
Net cash paid		$ 2,400,000	$ 0
Phoenix Environmental Services, Inc. [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 361,000
Inventory	27,000
Property, plant, & equipment	374,000
Equipment at customers	55,000
Intangible assets	710,000
Goodwill	1,173,000
Total purchase price	2,700,000
Less: contingent consideration	(300,000.0)
Net cash paid	$ 2,400,000