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SUBSEQUENT EVENTS (Details) | 1 Months Ended
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Jun. 30, 2017 warehouse
Subsequent Event [Member] | Dominican Republic [Member] |
Subsequent Event [Line Items] |
Number of stores expected in the future | 4

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- Definition Number Of Stores, Expected In the Future + References No definition available. + Details
Name: | psmt_NumberOfStoresExpectedInFuture
Namespace Prefix: | psmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_DO
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |