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v3.19.3

SUBSEQUENT EVENTS (Narrative) (Details) - warehouse | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Oct. 29, 2019
Subsequent Event [Line Items] |  |  |  |
Number of stores expected in the future |  |  | 49 |
Number of stores |  |  | 43 |
Jamaica [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores expected in the future |  |  | 1 |
Number of stores |  |  | 1 |
Colombia [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores expected in the future |  |  | 2 |
Number of stores |  |  | 7 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores |  |  |  | 44
Subsequent Event [Member] | Jamaica [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores expected in the future |  | 2 |  |
Subsequent Event [Member] | Colombia [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores expected in the future | 9 |  |  |

X
- 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 Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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: | srt_StatementGeographicalAxis=country_JM
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CO
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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