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STOCKHOLDERS EQUITY Dividends (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended
Feb. 04, 2015
Jan. 23, 2014
Feb. 28, 2015
Aug. 31, 2014
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Common Stock, Dividends, Per Share, Cash Paid       $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid    
Common Stock, Dividends, Per Share, Declared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared   $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.70us-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, payable     $ 0.35psmt_CommonStockDividendsPerSharePayable
/ us-gaap_StatementEquityComponentsAxis
= psmt_SecondOf2DividendPaymentsMember