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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Temporary Equity Disclosure [Abstract]      
Opening balance, Shares 3,300,000 1,650,000 1,500,000
Shares Issued, Shares 11,050,000 11,400,000 5,900,000
Shares Redeemed, Shares (11,850,000) (9,750,000) (5,750,000)
Ending balance, Shares 2,500,000 3,300,000 1,650,000
Opening balance, Amount $ 357,228,041 $ 203,700,538 $ 201,725,396
Shares Issued, Amount 1,198,371,197 1,273,611,058 785,537,645
Shares Redeemed, Amount (1,285,096,408) (1,089,370,082) (765,542,887)
Adjustment to period Shares due to currency movement and other, Amount (3,951,024) (30,713,473) (18,019,616)
Ending balance, Amount $ 266,551,806 $ 357,228,041 $ 203,700,538