PROPERTY AND EQUIPMENT (Narrative) (Details)		1 Months Ended	12 Months Ended
	Dec. 04, 2015 ft² property	Jan. 31, 2017 USD ($)	Aug. 31, 2017 USD ($) warehouse	Aug. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Number of stores | warehouse			39
Property and equipment, net			$ 557,829,000	$ 473,045,000
Accounts payable			272,248,000	267,173,000
Other accrued expenses			26,483,000	24,880,000
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Accounts payable			612,000	476,000
Other accrued expenses			$ 3,100,000	$ 1,500,000
Colombia [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
Miami-Dade County, Florida [Member]
Property, Plant and Equipment [Line Items]
Purchase price		$ 46,000,000
Minimum [Member] | Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life			3 years
Minimum [Member] | Building 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 Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life			25 years