BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	May 26, 2017	Mar. 06, 2017	Nov. 29, 2016	Sep. 16, 2016	Jul. 29, 2016	Jun. 30, 2016
Go Boy Pallets LLLC (Go Boy) | South
Business Acquisition
Purchase Price	$ 5,042
Intangible Assets	4,880
Net Tangible Assets	162
Acquired entity, prior year sales	$ 8,000
Percentage of assets purchased (as a percent)	100.00%
Robbins Manufacturing Co. (Robbins) | South
Business Acquisition
Purchase Price		$ 31,818
Intangible Assets		7,533
Net Tangible Assets		24,285
Acquired entity, prior year sales		$ 86,000
Percentage of assets purchased (as a percent)		100.00%
Quality Hardwood Sales, LLC (Quality) | North
Business Acquisition
Purchase Price		$ 22,789
Intangible Assets		14,341
Net Tangible Assets		8,448
Acquired entity, prior year sales		$ 30,000
Percentage of assets purchased (as a percent)		100.00%
The UBEECO Group Pty. Ltd. (Ubeeco) | All Other
Business Acquisition
Purchase Price			$ 9,455
Intangible Assets			7,313
Net Tangible Assets			2,142
Acquired entity, prior year sales			$ 20,000
Percentage of stock purchase (as a percent)			100.00%
idX Holdings, Inc. (idX) | All Other
Business Acquisition
Purchase Price				$ 66,046
Purchase price, holdback				11,337
Cash received				86,294
Consideration transferred for certain other obligations				6,536
Intangible Assets				17,016
Net Tangible Assets				49,030
Acquired entity, prior year sales				$ 300,000
Percentage of stock purchase (as a percent)				100.00%
Seven D Truss, L.P. | North
Business Acquisition
Purchase Price					$ 1,246
Intangible Assets					405
Net Tangible Assets					841
Acquired entity, prior year sales					$ 4,000
Idaho Western, Inc. (IWI) | West
Business Acquisition
Purchase Price						$ 10,787
Purchase price, holdback						500
Intangible Assets						6,817
Net Tangible Assets						4,248
Acquired entity, prior year sales						$ 21,000
Percentage of stock purchase (as a percent)						100.00%