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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 6 Months Ended 12 Months Ended
Apr. 30, 2015
Oct. 31, 2014
Equity [Abstract]    
Opening Balance, Shares 2,850,000us-gaap_CommonStockSharesOutstanding 3,550,000us-gaap_CommonStockSharesOutstanding
Shares issued, Shares 1,100,000us-gaap_StockIssuedDuringPeriodSharesIssuedForCash 400,000us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
Shares redeemed, Shares (1,200,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares (1,100,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares
Adjustment to period shares due to currency movement and other, Shares 0fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateShares 0fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateShares
Ending Balance, Shares 2,750,000us-gaap_CommonStockSharesOutstanding [1] 2,850,000us-gaap_CommonStockSharesOutstanding
Opening Balance, Amount $ 251,414,970us-gaap_CommonStockValue $ 338,556,957us-gaap_CommonStockValue
Shares issued, Amount 90,662,693us-gaap_StockIssuedDuringPeriodValueIssuedForCash 36,495,266us-gaap_StockIssuedDuringPeriodValueIssuedForCash
Shares redeemed, Amount (98,913,676)us-gaap_StockRedeemedOrCalledDuringPeriodValue (100,362,128)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Adjustment to period shares due to currency movement and other, Amount (17,462,824)fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateValue (23,275,125)fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateValue
Ending Balance, Amount $ 225,701,163us-gaap_CommonStockValue [1] $ 251,414,970us-gaap_CommonStockValue
[1] (Unaudited)