IDENTIFIED INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 117,854	$ 91,443
Accumulated Amortization	(70,401)	(64,660)
Carrying Amount	47,453	26,783
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	49,843	40,143
Accumulated Amortization	(34,718)	(32,900)
Carrying Amount	$ 15,125	$ 7,243
Trade names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Trade names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years	15 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	13 years	13 years
Original Cost	$ 67,711	$ 51,000
Accumulated Amortization	(35,383)	(31,460)
Carrying Amount	$ 32,328	$ 19,540
Customer relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	8 years
Customer relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	13 years
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Original Cost	$ 300	$ 300
Accumulated Amortization	(300)	(300)
Carrying Amount	$ 0	$ 0
Non-compete agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years
Non-compete agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years