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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Equity [Abstract]      
Opening balance, Shares 3,550,000us-gaap_CommonStockSharesOutstanding 4,950,000us-gaap_CommonStockSharesOutstanding 6,350,000us-gaap_CommonStockSharesOutstanding
Shares issued, Shares 400,000us-gaap_StockIssuedDuringPeriodSharesIssuedForCash 600,000us-gaap_StockIssuedDuringPeriodSharesIssuedForCash 150,000us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
Shares redeemed, Shares (1,100,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares (2,000,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares (1,550,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares
Adjustment to period shares due to currency movement and other, Shares 0fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateShares 0fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateShares 0fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateShares
Ending balance, Shares 2,850,000us-gaap_CommonStockSharesOutstanding 3,550,000us-gaap_CommonStockSharesOutstanding 4,950,000us-gaap_CommonStockSharesOutstanding
Opening balance, Amount $ 338,556,957us-gaap_CommonStockValue $ 492,510,069us-gaap_CommonStockValue $ 635,831,194us-gaap_CommonStockValue
Shares issued, Amount 36,495,266us-gaap_StockIssuedDuringPeriodValueIssuedForCash 58,495,917us-gaap_StockIssuedDuringPeriodValueIssuedForCash 14,846,422us-gaap_StockIssuedDuringPeriodValueIssuedForCash
Shares redeemed, Amount (100,362,128)us-gaap_StockRedeemedOrCalledDuringPeriodValue (194,992,928)us-gaap_StockRedeemedOrCalledDuringPeriodValue (153,417,420)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Adjustment to period shares due to currency movement and other, Amount (23,275,125)fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateValue (17,456,101)fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateValue (4,750,127)fxc_AdjustmentToPeriodSharesCurrencyMovementAndOtherAggregateValue
Ending balance, Amount $ 251,414,970us-gaap_CommonStockValue $ 338,556,957us-gaap_CommonStockValue $ 492,510,069us-gaap_CommonStockValue