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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 3,500,000 2,500,000
Shares issued, Shares 4,250,000 10,300,000
Shares redeemed, Shares (5,350,000) (9,300,000)
Ending Balance, Shares 2,400,000 3,500,000
Opening Balance, Amount $ 393,375,323 $ 266,551,806
Shares issued, Amount 490,203,597 1,108,131,814
Shares redeemed, Amount (617,121,663) (1,000,949,967)
Adjustment to period Shares due to currency movement and other, Amount 2,824,696 19,641,670
Ending Balance, Amount $ 269,281,953 $ 393,375,323