BASIS OF PRESENTATION, ORGANIZATION AND OPERATIONS OF THE COMPANY - Accounting for Contracts (Details)		3 Months Ended		9 Months Ended
	Apr. 26, 2016	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 29, 2017 USD ($) entity subsidiary segment	Sep. 30, 2016 USD ($)	Dec. 30, 2016 USD ($)
Accounting for Contracts
Number of VIE | entity				1
Percentage on costs incurred to provide administrative services	10.00%			10.00%
Number of subsidiaries aggregated as one reporting segment | subsidiary				3
Number of reportable segments into which three of the six subsidiaries are aggregated | segment				1
Number of subsidiaries each of which comprise separate reporting segments | subsidiary				3
Payroll taxes, bonuses and employee benefit costs for all Company personnel		$ 8,691,000	$ 7,825,000	$ 26,092,000	$ 23,035,000
Facilities costs		1,235,000	$ 1,039,000	3,478,000	$ 2,978,000
Revenue or cost recorded by the entity when acting solely as an agent				0
Retained accounts receivable		$ 10,100,000		$ 10,100,000		$ 5,200,000
Number of wholly owned subsidiaries | subsidiary				6
Number of reportable segments | segment				4
Cost of Sales
Accounting for Contracts
Payroll taxes, bonuses and employee benefit costs for all Company personnel				$ 0
Facilities costs				$ 0