Name:	psmt_PerformanceBasedRestrictedStockUnitExpense
Namespace Prefix:	psmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The noncash expense that represents the cost of restricted stock award distributed to employees as compensation.

No definition available.

Name:	psmt_RestrictedStockAwardExpense
Namespace Prefix:	psmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The noncash expense that represents the cost of restricted stock units distributed to employees as compensation.

No definition available.

Name:	psmt_RestrictedStockUnitExpense
Namespace Prefix:	psmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

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

Amount of noncash expense for share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of noncash expense for option under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585