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REVENUE RECOGNITION (Narrative) (Details) | 3 Months Ended
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Nov. 30, 2020 USD ($) country
Platinum membership redemption rate | 100.00%
Annual membership fee | $ | $ 75
Platinum membership rebate | 2.00%
Maximum Platinum annual membership rebate | $ | $ 500
Platinum membership recorded liability | 95.00%
Breakage revenue percent | 5.00%
Number of countries | country | 13
Platinum Membership [Member] |
Number of countries | country | 12

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- Definition Maximum Platinum Membership Rebate + References No definition available. + Details
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Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Platinum Membership Annual Fee + References No definition available. + Details
Name: | psmt_PlatinumMembershipAnnualFee
Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Platinum Membership Breakage Revenue Percent + References No definition available. + Details
Name: | psmt_PlatinumMembershipBreakageRevenuePercent
Namespace Prefix: | psmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Platinum membership rebate + References No definition available. + Details
Name: | psmt_PlatinumMembershipRebate
Namespace Prefix: | psmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Platinum Membership Recorded Liability + References No definition available. + Details
Name: | psmt_PlatinumMembershipRecordedLiability
Namespace Prefix: | psmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Platinum Membership Redemption Rate + References No definition available. + Details
Name: | psmt_PlatinumMembershipRedemptionRate
Namespace Prefix: | psmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=psmt_PlatinumMembershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |