Dividends Payable, Date Payable

No definition available.

Name:	psmt_DividendsPayableDatePayable
Namespace Prefix:	psmt_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DividendsAxis=psmt_DividendDeclared1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=psmt_FirstPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=psmt_SecondPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=psmt_DividendDeclared2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS' EQUITY (Schedule of Dividends) (Details) - $ / shares						9 Months Ended
	Feb. 26, 2021	Feb. 04, 2021	Aug. 31, 2020	Feb. 28, 2020	Feb. 06, 2020	May 31, 2021
2021 Dividend Declared [Member]
Dividends Payable [Line Items]
Declared						Feb. 04, 2021
2021 Dividend Declared [Member] \| First Payment [Member]
Dividends Payable [Line Items]
Amount		$ 0.70
Record Date						Feb. 15, 2021
Date Paid						Feb. 26, 2021
2021 Dividend Declared [Member] \| Second Payment [Member]
Dividends Payable [Line Items]
Record Date						Aug. 15, 2021
Date Payable						Aug. 31, 2021
Payment Amount	$ 0.35					$ 0.35
2020 Dividend Declared [Member]
Dividends Payable [Line Items]
Declared						Feb. 06, 2020
2020 Dividend Declared [Member] \| First Payment [Member]
Dividends Payable [Line Items]
Amount					$ 0.70
Record Date						Feb. 15, 2020
Date Paid						Feb. 28, 2020
2020 Dividend Declared [Member] \| Second Payment [Member]
Dividends Payable [Line Items]
Record Date						Aug. 15, 2020
Date Paid						Aug. 31, 2020
Payment Amount			$ 0.35	$ 0.35