DISCONTINUED OPERATIONS - Additional Information (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 28, 2016	Aug. 27, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 20, 2015
Discontinued Operations
Total consideration received		$ 24,600
PBM Services
Discontinued Operations
Reduction in total consideration							$ 1,000
Gain on sale before income taxes				$ 0	$ (11,424)	$ 0
Home Health Business
Discontinued Operations
Gain on sale before income taxes			$ (2,100)	$ 0	$ 0	$ (2,067)
Home Health Business | Amendment Number One
Discontinued Operations
Total consideration received			59,500
Additional payment received			1,100
Final purchase price received			$ 60,600
Pharmacy Services Asset Sale | Walgreens | Arbitration Settled Litigation
Discontinued Operations
Settlement amount accrued	$ 5,800
Total sales claimed in violation of agreement, percentage	3.00%