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COMPANY OVERVIEW AND BASIS OF PRESENTATION (Details)
Feb. 28, 2015
Club
Company Overview [Line Items]  
Number of stores 36us-gaap_NumberOfStores
Equity Method Investment, Ownership Percentage 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Foreign Countries  
Company Overview [Line Items]  
Number of countries 12us-gaap_NumberOfCountriesInWhichEntityOperates
/ dei_EntityByLocationAxis
= psmt_ForeignCountriesMember
COSTA RICA  
Company Overview [Line Items]  
Number of stores 6us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_CR
COLOMBIA  
Company Overview [Line Items]  
Number of stores 6us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_CO
PANAMA  
Company Overview [Line Items]  
Number of stores 4us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_PA
TRINIDAD AND TOBAGO  
Company Overview [Line Items]  
Number of stores 4us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_TT
Guatemala  
Company Overview [Line Items]  
Number of stores 3us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_GT
HONDURAS  
Company Overview [Line Items]  
Number of stores 3us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_HN
Dominican Republic  
Company Overview [Line Items]  
Number of stores 3us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_DO
EL SALVADOR  
Company Overview [Line Items]  
Number of stores 2us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_SV
Aruba  
Company Overview [Line Items]  
Number of stores 1us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_AW
Barbados  
Company Overview [Line Items]  
Number of stores 1us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_BB
Jamaica  
Company Overview [Line Items]  
Number of stores 1us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_JM
Nicaragua  
Company Overview [Line Items]  
Number of stores 1us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_NI
Domestic Territories  
Company Overview [Line Items]  
Number of countries 1us-gaap_NumberOfCountriesInWhichEntityOperates
/ dei_EntityByLocationAxis
= psmt_DomesticTerritoriesMember
United States Virgin Islands  
Company Overview [Line Items]  
Number of stores 1us-gaap_NumberOfStores
/ dei_EntityByLocationAxis
= country_VI