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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 2,650,000 2,850,000
Shares Issued, Shares 350,000 350,000
Shares Redeemed, Shares (500,000) (550,000)
Adjustment to period shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,500,000 2,650,000
Opening Balance, Amount $ 195,544,021 $ 216,269,477
Shares Issued, Amount 25,955,104 26,133,576
Shares Redeemed, Amount (37,076,936) (41,053,575)
Adjustment to period shares due to currency movement and other, Amount (3,909,090) (5,805,457)
Ending Balance, Amount $ 180,513,099 $ 195,544,021