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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 2,300,000 2,650,000
Shares issued, Shares 400,000 500,000
Shares redeemed, Shares (550,000) (850,000)
Adjustment to period shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,150,000 2,300,000
Opening Balance, Amount $ 176,007,716 $ 195,544,021
Shares issued, Amount 30,790,050 37,735,347
Shares redeemed, Amount (42,333,462) (64,137,640)
Adjustment to period shares due to currency movement and other, Amount (1,504,599) 6,865,988
Ending Balance, Amount $ 162,959,705 $ 176,007,716