ACQUISITION (Pro Forma Financial Information) (Details) - USD ($)		3 Months Ended
		Nov. 30, 2018	Nov. 30, 2017
Business Acquisition [Line Items]
Pro forma net income attributable to noncontrolling interest		$ 33,000
Amortization		599,000
Pro Forma [Member]
Business Acquisition [Line Items]
Pro forma total revenues			$ 776,375,000
Pro forma net income attributable to PriceSmart, Inc.	[1]		18,652,000
Pro forma net income attributable to noncontrolling interest			61,000
Post-combination compensation expense			750,000
Amortization			599,000
Remaining purchase price contingency			$ 3,900,000
Aeropost, Inc [Member]
Business Acquisition [Line Items]
Pro forma net income attributable to noncontrolling interest		$ 3,900,000

[1] Includes the pro forma recognition of $750,000 post-combination compensation expense, which represents three months of continued service amortization required to satisfy the $3.9 million remaining purchase price contingency, and $599,000 for the amortization of intangible assets for three months.