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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 2,850,000 2,850,000
Shares issued, Shares 200,000 1,600,000
Shares redeemed, Shares (250,000) (1,600,000)
Ending Balance, Shares 2,800,000 2,850,000
Opening Balance, Amount $ 216,269,477 $ 251,414,970
Shares issued, Amount 14,684,858 127,858,942
Shares redeemed, Amount (18,351,127) (127,864,231)
Adjustment to period shares due to currency movement and other, Amount 8,889,636 (35,140,204)
Ending Balance, Amount $ 221,492,844 $ 216,269,477