Document And Entity Information - shares	9 Months Ended
	May 31, 2018	Jun. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	PRICESMART INC
Entity Central Index Key	0001041803
Current Fiscal Year End Date	--08-31
Trading Symbol	psmt
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 31, 2018
Entity Common Stock, Shares Outstanding		30,461,536