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STOCKHOLDERS EQUITY Dividends (Details) (USD $)
0 Months Ended 3 Months Ended
Jan. 23, 2014
Nov. 30, 2014
Nov. 30, 2013
Feb. 28, 2014
Aug. 31, 2014
Common Stock, Dividends, Per Share, Declared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.00us-gaap_CommonStockDividendsPerShareDeclared $ 0.00us-gaap_CommonStockDividendsPerShareDeclared    
first of two dividend payments [Member]          
Common Stock, Dividends, Per Share, Cash Paid       $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= psmt_FirstOfTwoDividendPaymentsMember
 
Second of 2 dividend payments [Member]          
Common Stock, Dividends, Per Share, Cash Paid         $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= psmt_SecondOf2DividendPaymentsMember