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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Exit or Disposal Cost Obligations) (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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May 31, 2017 | Aug. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |
Exit obligation, Other long-term liabilities | $ 496,000 |
Current exit obligation |  | $ 57,000
Exit obligation, Warehouse expenses |  | $ 1,400,000

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- Definition Disposal Group, Business Exit Obligation + References No definition available. + Details
Name: | psmt_DisposalGroupBusinessExitObligation
Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disposal Group, Business Exit Obligation, Other Long-Term Liabilities + References No definition available. + Details
Name: | psmt_DisposalGroupBusinessExitObligationOtherLongTermLiabilities
Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disposal Group, Business Exit Obligation, Warehouse Expenses + References No definition available. + Details
Name: | psmt_DisposalGroupBusinessExitObligationWarehouseExpenses
Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration