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Statements of Financial Condition(USD ($))
Oct. 31, 2014
Oct. 31, 2013
Current Assets:    
Japanese Yen deposits, interest bearing $ 82,529,967us-gaap_InterestBearingDepositsInBanks $ 144,517,524us-gaap_InterestBearingDepositsInBanks
Japanese Yen deposits, non-interest bearing 0fxy_NonInterestBearingDepositsInBanks 0fxy_NonInterestBearingDepositsInBanks
Subscriptions receivable 21,711,361us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable  
Total Current Assets 104,241,328us-gaap_AssetsCurrent 144,517,524us-gaap_AssetsCurrent
Current Liabilities:    
Accrued Sponsor's fee 27,938us-gaap_OtherAccruedLiabilitiesCurrent 53,674us-gaap_OtherAccruedLiabilitiesCurrent
Total Current Liabilities 27,938us-gaap_LiabilitiesCurrent 53,674us-gaap_LiabilitiesCurrent
Commitments and Contingent Liabilities (note 9)      
Redeemable Capital Shares, at redemption value, no par value, 53,870,000 and 48,870,000 authorized, respectively - 1,200,000 and 1,450,000 issued and outstanding, respectively 104,213,390us-gaap_CommonStockValue 144,463,850us-gaap_CommonStockValue
Shareholders' Equity:    
Retained Earnings 0us-gaap_RetainedEarningsAccumulatedDeficit 0us-gaap_RetainedEarningsAccumulatedDeficit
Cumulative Translation Adjustment 0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Total Liabilities, Redeemable Capital Shares and Shareholders' Equity $ 104,241,328us-gaap_LiabilitiesAndStockholdersEquity $ 144,517,524us-gaap_LiabilitiesAndStockholdersEquity