Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	8 Months Ended		12 Months Ended
	Sep. 10, 2016	Sep. 12, 2015	Jan. 02, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 2,207	$ 3,927	$ 3,927
Balance acquired from FCC Environmental, including measurement period adjustments	0		2,701
Provision for bad debts	714	$ 1,081	1,009
Accounts written off, net of recoveries	(527)		(5,430)
Balance at end of period	$ 2,394		$ 2,207