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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Stock Based Compensation) (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 USD ($) | Aug. 31, 2019 item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |
Number of equity awards issued | item |  | 3
Separation charge | $ 3,800,000 |
Other separation costs | 892,000 |
Separation charge, net of tax | 3,600,000 |
Non-cash charges related to accelerated compensation costs | $ 2,900,000 |

X
- Definition Number Of Equity Awards Offered + References No definition available. + Details
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Balance Type: | na
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X
- Definition Other Separation Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Separation Charge + References No definition available. + Details
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Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Separation Charge, Net + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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