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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 3,500,000 2,500,000
Shares issued, Shares 3,850,000 10,300,000
Shares redeemed, Shares (3,950,000) (9,300,000)
Ending Balance, Shares 3,400,000 3,500,000
Opening Balance, Amount $ 393,375,323 $ 266,551,806
Shares issued, Amount 449,024,167 1,108,131,814
Shares redeemed, Amount (460,981,544) (1,000,949,967)
Adjustment to period Shares due to currency movement and other, Amount 13,307,536 19,641,670
Ending Balance, Amount $ 394,725,482 $ 393,375,323