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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 2,350,000 2,550,000
Shares Issued, Shares 200,000 250,000
Shares Redeemed, Shares (200,000) (450,000)
Ending Balance, Shares 2,350,000 2,350,000
Opening Balance, Amount $ 178,918,567 $ 182,130,886
Shares Issued, Amount 14,883,020 18,499,561
Shares Redeemed, Amount (14,878,149) (33,314,772)
Adjustment to period Shares due to currency movement and other, Amount (378,901) 11,602,892
Ending Balance, Amount $ 178,544,537 $ 178,918,567