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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 3,500,000 2,500,000
Shares issued, Shares 2,150,000 10,300,000
Shares redeemed, Shares (2,900,000) (9,300,000)
Ending Balance, Shares 2,750,000 3,500,000
Opening Balance, Amount $ 393,375,323 $ 266,551,806
Shares issued, Amount 247,011,468 1,108,131,814
Shares redeemed, Amount (333,345,288) (1,000,949,967)
Adjustment to period Shares due to currency movement and other, Amount 22,792,338 19,641,670
Ending Balance, Amount $ 329,833,841 $ 393,375,323