GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Other Than Goodwill (Details) (USD $) In Thousands, unless otherwise specified	Sep. 26, 2014		Dec. 27, 2013
Amortizable intangible assets (1):
Gross Carrying Amount	$ 149,712	[1]	$ 42,912	[1]
Accumulated Amortization	(23,843)	[1]	(17,107)	[1]
Net Carrying Amount	125,869	[1]	25,805	[1]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2014	4,501
2015	17,702
2016	17,266
2017	15,237
2018	12,456
Thereafter	58,707
Net Carrying Amount	125,869	[1]	25,805	[1]
Customer relationships
Amortizable intangible assets (1):
Gross Carrying Amount	125,040	[1]	35,940	[1]
Accumulated Amortization	(19,194)	[1]	(13,942)	[1]
Net Carrying Amount	105,846	[1]	21,998	[1]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net Carrying Amount	105,846	[1]	21,998	[1]
Trade name/trademarks
Amortizable intangible assets (1):
Gross Carrying Amount	4,572	[1]	5,172	[1]
Accumulated Amortization	(2,816)	[1]	(2,708)	[1]
Net Carrying Amount	1,756	[1]	2,464	[1]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net Carrying Amount	1,756	[1]	2,464	[1]
Non-compete agreements
Amortizable intangible assets (1):
Gross Carrying Amount	1,800	[1]	1,800	[1]
Accumulated Amortization	(727)	[1]	(457)	[1]
Net Carrying Amount	1,073	[1]	1,343	[1]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net Carrying Amount	1,073	[1]	1,343	[1]
Technology-Based Intangible Assets [Member]
Amortizable intangible assets (1):
Gross Carrying Amount	18,300	[1]	0	[1]
Accumulated Amortization	(1,106)	[1]	0	[1]
Net Carrying Amount	17,194	[1]	0	[1]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net Carrying Amount	$ 17,194	[1]	$ 0	[1]

[1] Excludes assets that are fully amortized