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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,200,000 1,600,000
Shares Issued, Shares 2,650,000 5,050,000
Shares Redeemed, Shares (2,650,000) (5,450,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 1,200,000 1,200,000
Opening Balance, Amount $ 110,230,193 $ 128,567,957
Shares Issued, Amount 226,714,097 443,142,449
Shares Redeemed, Amount (226,674,696) (477,929,067)
Adjustment to period Shares due to currency movement and other, Amount (6,611,740) 16,448,854
Ending Balance, Amount $ 103,657,854 $ 110,230,193