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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Income Tax (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Income Taxes [Line Items]        
Federal tax provision at statutory rates 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State Taxes, net of Federal benefit 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Differences in foreign tax rates (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (5.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (4.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (4.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Permanent items and other adjustments 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Increase (decrease) in Foreign valuation allowance 1.20%psmt_EffectiveIncomeTaxRateReconciliationChangeInForeignDeferredTaxAssetsValuationAllowance 0.00%psmt_EffectiveIncomeTaxRateReconciliationChangeInForeignDeferredTaxAssetsValuationAllowance 2.00%psmt_EffectiveIncomeTaxRateReconciliationChangeInForeignDeferredTaxAssetsValuationAllowance (0.10%)psmt_EffectiveIncomeTaxRateReconciliationChangeInForeignDeferredTaxAssetsValuationAllowance
Provision for income taxes 35.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 28.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Payments under appeal [Member]        
Income Taxes [Line Items]        
Payments for Other Taxes     4.2us-gaap_PaymentsForOtherTaxes
/ psmt_IncometaxsituationsAxis
= psmt_PaymentsunderappealMember
 
Tax effect of foreign currency [Member]        
Income Taxes [Line Items]        
Effective income tax rate change 2.00%psmt_EffectiveIncomeTaxRateChange
/ psmt_IncometaxsituationsAxis
= psmt_TaxeffectofforeigncurrencyMember
  1.10%psmt_EffectiveIncomeTaxRateChange
/ psmt_IncometaxsituationsAxis
= psmt_TaxeffectofforeigncurrencyMember
 
Increased Taxable Loss in Colombia [Member]        
Income Taxes [Line Items]        
Effective income tax rate change (4.20%)psmt_EffectiveIncomeTaxRateChange
/ psmt_IncometaxsituationsAxis
= psmt_IncreasedTaxableLossinColombiaMember
  (4.70%)psmt_EffectiveIncomeTaxRateChange
/ psmt_IncometaxsituationsAxis
= psmt_IncreasedTaxableLossinColombiaMember
 
Tax contingencies [Member]        
Income Taxes [Line Items]        
Provisional assessments     5.2psmt_Provisionalassessments
/ us-gaap_OtherCommitmentsAxis
= psmt_TaxcontingenciesMember
 
Tax contingencies [Member] | Withholding taxes [Member]        
Income Taxes [Line Items]        
Provisional assessments     2.6psmt_Provisionalassessments
/ psmt_IncometaxsituationsAxis
= psmt_WithholdingtaxesMember
/ us-gaap_OtherCommitmentsAxis
= psmt_TaxcontingenciesMember