BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands						9 Months Ended	12 Months Ended
	May 26, 2017	Mar. 06, 2017	Nov. 29, 2016	Sep. 16, 2016	Jul. 29, 2016	Sep. 24, 2016	Sep. 30, 2017
Business Acquisition
Repayments of debt of acquiree						$ 92,830
Aggregate acquisitions' revenue							$ 292,100
Aggregate acquisitions' operating profit							$ 5,300
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		14,266
Net Tangible Assets		8,523
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			7,314
Net Tangible Assets			2,141
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				$ 66,691
Purchase price, holdback				11,337
Cash received				86,294
Consideration transferred for certain other obligations				6,536
Intangible Assets				17,455
Net Tangible Assets				49,236
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