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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,200,000 1,600,000
Shares Issued, Shares 1,600,000 5,050,000
Shares Redeemed, Shares (750,000) (5,450,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,050,000 1,200,000
Opening Balance, Amount $ 110,230,193 $ 128,567,957
Shares Issued, Amount 136,181,023 443,142,449
Shares Redeemed, Amount (63,841,156) (477,929,067)
Adjustment to period Shares due to currency movement and other, Amount (7,010,332) 16,448,854
Ending Balance, Amount $ 175,559,728 $ 110,230,193