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STOCK BASED COMPENSATION (Summary of Components of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Nov. 30, 2016 | Nov. 30, 2015
STOCK BASED COMPENSATION [Abstract] |  |
Options granted to directors | $ 18 | $ 25
Restricted stock awards | 1,871 | 1,701
Restricted stock units | 553 | 374
Stock-based compensation expense | $ 2,442 | $ 2,100

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- Definition The noncash expense that represents the cost of restricted stock award distributed to employees as compensation. + References No definition available. + Details
Name: | psmt_RestrictedStockAwardExpense
Namespace Prefix: | psmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The noncash expense that represents the cost of restricted stock units distributed to employees as compensation. + References No definition available. + Details
Name: | psmt_RestrictedStockUnitExpense
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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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_StockOptionPlanExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration