COMMITMENTS AND CONTINGENCIES - Obligations by year (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Purchase obligations
2015	$ 30,947
2016	13,526
2017	8,876
2018	6,614
2019	6,601
Thereafter	35,995
Total	102,559
Lease Obligation
2015	11,152
2016	10,535
2017	9,655
2018	8,431
2019	7,075
Thereafter	31,180
Total	78,028
Sublease Income
2015	(2,018)
2016	(1,442)
2017	(737)
2018	(421)
2019	(296)
Thereafter	(698)
Total	(5,612)
Net lease obligations
2015	9,134
2016	9,093
2017	8,918
2018	8,010
2019	6,779
Thereafter	30,482
Total	72,416
Contractual Obligation, Fiscal Year Maturity [Abstract]
2015	44,501
2016	25,790
2017	20,139
2018	16,367
2019	14,748
Thereafter	71,389
Total	192,934
Self-Insurance
Workers' compensation obligations
2015	4,420
2016	3,171
2017	2,345
2018	1,743
2019	1,368
Thereafter	4,912
Total	$ 17,959	$ 18,700