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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 2,650,000 2,850,000 2,850,000
Shares Issued, Shares 500,000 350,000 1,600,000
Shares Redeemed, Shares (850,000) (550,000) (1,600,000)
Adjustment to period shares due to currency movement and other, Shares 0 0 0
Ending Balance, Shares 2,300,000 2,650,000 2,850,000
Opening Balance, Amount $ 195,544,021 $ 216,269,477 $ 251,414,970
Shares Issued, Amount 37,735,347 26,133,576 127,858,942
Shares Redeemed, Amount (64,137,640) (41,053,575) (127,864,231)
Adjustment to period shares due to currency movement and other, Amount 6,865,988 (5,805,457) (35,140,204)
Ending Balance, Amount $ 176,007,716 $ 195,544,021 $ 216,269,477