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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Restricted Cash (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Aug. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents, Current $ 1,500us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue $ 2,353us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalents, Noncurrent 25,428us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 27,013us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Restricted Cash and Cash Equivalents 26,928us-gaap_RestrictedCashAndCashEquivalents 29,366us-gaap_RestrictedCashAndCashEquivalents
Federalregulatoryrequirements [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents, Current 57us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_FederalregulatoryrequirementsMember		 [1] 58us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_FederalregulatoryrequirementsMember		 [1]
Restricted Cash and Cash Equivalents, Noncurrent 1,428us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_FederalregulatoryrequirementsMember		 [1] 1,293us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_FederalregulatoryrequirementsMember		 [1]
Land [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents, Current 1,443us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 1,095us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Loans [Member] | Banco del Pais [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents, Current 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_BancoDelPaisMember		 1,200us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_BancoDelPaisMember
Restricted Cash and Cash Equivalents, Noncurrent 0us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_BancoDelPaisMember		 1,720us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_BancoDelPaisMember
Loans [Member] | Citibank and Scotiabank [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents, Noncurrent $ 24,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_CitibankAndScotiabankMember		 $ 24,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= psmt_CitibankAndScotiabankMember
[1] (1) Other short-term and long-term restricted cash consists mainly of cash deposits held within banking institutions in compliance with federal regulatory requirements in Costa Rica and Panama.