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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 1,600,000 1,200,000
Shares issued, Shares 4,000,000 4,900,000
Shares redeemed, Shares (4,000,000) (4,500,000)
Ending Balance, Shares 1,600,000 1,600,000
Opening Balance, Amount $ 128,567,957 $ 104,213,390
Shares issued, Amount 332,310,495 395,772,647
Shares redeemed, Amount (332,115,103) (363,514,395)
Adjustment to period Shares due to currency movement and other, Amount 15,952,381 (7,903,685)
Ending Balance, Amount $ 144,715,730 $ 128,567,957