COMPANY OVERVIEW AND BASIS OF PRESENTATION (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 31, 2018 USD ($) ft² warehouse country	Aug. 31, 2018 USD ($) ft² warehouse country	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Nov. 30, 2019 warehouse	Jun. 30, 2019 warehouse	May 31, 2018 warehouse	Oct. 31, 2017 warehouse
Company Overview And Basis Of Presentation [Line Items]
Number of stores	41	41
Number of countries | country	13	13
Ownership interest	100.00%	100.00%
Excess tax benefits, Operating activities | $			$ 165,000	$ 610,000
Retained earnings | $	$ 473,954	$ 473,954	420,866
Additional paid-in capital | $	$ 432,882	432,882	422,395
Cost of goods sold - net merchandise sales | $		$ 7,669
Colombia [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	7	7
Costa Rica [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	7	7						1
Panama [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	5	5
Trinidad [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	4	4
Dominican Republic [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	4	4					1
Guatemala [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	3	3
Honduras [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	3	3
El Salvador [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	2	2
Nicaragua [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	2	2
Aruba [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	1	1
Barbados [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	1	1
Jamaica [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	1	1
United States Virgin Islands [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores	1	1
Reclassified [Member]
Company Overview And Basis Of Presentation [Line Items]
Retained earnings | $			367
Additional paid-in capital | $			$ (367)
Scenario, Forecast [Member] | Panama [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores						6
Scenario, Forecast [Member] | Dominican Republic [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores						5
Scenario, Forecast [Member] | Guatemala [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of stores					4
Foreign Countries [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of countries | country	12	12
Domestic Territories [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of countries | country	1	1
Aeropost, Inc [Member] | Latin America [Member]
Company Overview And Basis Of Presentation [Line Items]
Number of countries | country	38	38
Aeropost, Inc [Member] | Reclassified [Member]
Company Overview And Basis Of Presentation [Line Items]
Cost of goods sold - net merchandise sales | $	$ 2,000
Minimum [Member]
Company Overview And Basis Of Presentation [Line Items]
Square footage of club warehouse | ft²	50,000	50,000
Minimum [Member] | Panama and Dominican Republic [Member]
Company Overview And Basis Of Presentation [Line Items]
Square footage of club warehouse | ft²	30,000	30,000
Maximum [Member]
Company Overview And Basis Of Presentation [Line Items]
Square footage of club warehouse | ft²	60,000	60,000
Maximum [Member] | Panama and Dominican Republic [Member]
Company Overview And Basis Of Presentation [Line Items]
Square footage of club warehouse | ft²	40,000	40,000