PROPERTY AND EQUIPMENT (Narrative) (Details)		12 Months Ended
	Dec. 04, 2015 ft² property	Aug. 31, 2016 USD ($) warehouse	Aug. 31, 2017 warehouse	Aug. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Number of stores | warehouse		38
Property and equipment, net		$ 473,045,000		$ 433,040,000
Accounts payable		267,173,000		241,978,000
Other accrued expenses		24,880,000		23,558,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Accounts payable		280,000		458,000
Other accrued expenses		$ 1,700,000		$ 1,500,000
Colombia [Member]
Property, Plant and Equipment [Line Items]
Number of stores | warehouse		6
Colombia [Member] | Scenario, Forecast [Member]
Property, Plant and Equipment [Line Items]
Number of stores | warehouse			7
Honduras [Member]
Property, Plant and Equipment [Line Items]
Number of stores | warehouse		3
Option to acquire, Number of properties | property	2
Area of land | ft²	59,353
Property and equipment, net		$ 1,900,000
Minimum [Member] | Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life		3 years
Minimum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life		10 years
Maximum [Member] | Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life		15 years
Maximum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life		25 years