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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Equity [Abstract]      
Opening balance, Shares 4,950,000 6,350,000 5,850,000
Shares issued, Shares 600,000 150,000 7,700,000
Shares redeemed, Shares (2,000,000) (1,550,000) (7,200,000)
Adjustment to period shares due to currency movement and other, Shares         
Ending balance, Shares 3,550,000 4,950,000 6,350,000
Opening balance, Amount $ 492,510,069 $ 635,831,194 $ 571,687,445
Shares issued, Amount 58,495,917 14,846,422 775,887,155
Shares redeemed, Amount (194,992,928) (153,417,420) (725,504,395)
Adjustment to period shares due to currency movement and other, Amount (17,456,101) (4,750,127) 13,760,989
Ending balance, Amount $ 338,556,957 $ 492,510,069 $ 635,831,194