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SUBSEQUENT EVENTS (Details)	1 Months Ended
	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

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Namespace Prefix:	psmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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