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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 2,300,000 2,650,000 2,850,000
Shares issued, Shares 550,000 500,000 350,000
Shares redeemed, Shares (750,000) (850,000) (550,000)
Adjustment to period Shares due to currency movement 0 0 0
Ending Balance, Shares 2,100,000 2,300,000 2,650,000
Opening Balance, Amount $ 176,007,716 $ 195,544,021 $ 216,269,477
Shares issued, Amount 42,164,974 37,735,347 26,133,576
Shares redeemed, Amount (57,493,667) (64,137,640) (41,053,575)
Adjustment to period Shares due to currency movement (2,845,711) 6,865,988 (5,805,457)
Ending Balance, Amount $ 157,833,312 $ 176,007,716 $ 195,544,021