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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 2 Months Ended 12 Months Ended
Dec. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 2,100,000 2,300,000 2,650,000
Shares issued, Shares 400,000 550,000 500,000
Shares redeemed, Shares (250,000) (750,000) (850,000)
Adjustment to period Shares due to currency movement 0 0 0
Ending Balance, Shares 2,250,000 2,100,000 2,300,000
Opening Balance, Amount $ 157,833,312 $ 176,007,716 $ 195,544,021
Shares issued, Amount 29,260,143 42,164,974 37,735,347
Shares redeemed, Amount (18,556,077) (57,493,667) (64,137,640)
Adjustment to period Shares due to currency movement (5,954,026) (2,845,711) 6,865,988
Ending Balance, Amount $ 162,583,352 $ 157,833,312 $ 176,007,716