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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2015
Oct. 31, 2014
Changes In Redeemable Capital Shares [Abstract]    
Opening balance, Shares 1,650,000 1,500,000
Shares issued, Shares 9,500,000 5,900,000
Shares redeemed, Shares (8,650,000) (5,750,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending balance, Shares 2,500,000 [1] 1,650,000
Opening balance, Amount $ 203,700,538 $ 201,725,396
Shares issued, Amount 1,067,292,275 785,537,645
Shares redeemed, Amount (971,653,552) (765,542,887)
Adjustment to period Shares due to currency movement and other, Amount (28,253,317) (18,019,616)
Ending balance, Amount $ 271,085,944 [1] $ 203,700,538
[1] (Unaudited)