Defined Contribution Plan, Employee's Percent Of Salary Contribution

No definition available.

Name:	psmt_DefinedContributionPlanEmployeeSPercentOfSalaryContribution
Namespace Prefix:	psmt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Countries Unfunded Post-Employment Benefit Plans (Defined Benefit Plans) In Which The Subsidiary Is Required To Pay A Specified Benefit

+ References

No definition available.

+ Details

Name:	psmt_NumberOfCountriesUnfundedPostEmploymentBenefitPlansDefinedBenefitPlansInWhichSubsidiaryIsRequiredToPaySpecifiedBenefit
Namespace Prefix:	psmt_
Data Type:	xbrli:integerItemType
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

+ Details

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

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=psmt_NonOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

POST EMPLOYMENT PLANS (Narrative) (Details) $ in Millions	12 Months Ended
POST EMPLOYMENT PLANS (Narrative) (Details) $ in Millions	Aug. 31, 2023 USD ($) country	Aug. 31, 2022 USD ($)	Aug. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Maximum contribution rate of annual eligible earnings to be matched under 401(k) plans	4.00%
Number of countries have unfunded post-employment benefit plans (defined benefit plans) in which the subsidiary is required to pay a specified benefit \| country	3
U.S. federal
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 2.9	$ 2.9	$ 2.6
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4.5	$ 3.6	$ 3.0
Maximum \| Non-Officer
Defined Benefit Plan Disclosure [Line Items]
Employee contribution rate	2.00%