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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Changes In Redeemable Capital Shares [Abstract]      
Opening balance, Shares 1,650,000 1,500,000 2,050,000
Shares issued, Shares 11,400,000 5,900,000 6,800,000
Shares redeemed, Shares (9,750,000) (5,750,000) (7,350,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0 0
Ending balance, Shares 3,300,000 1,650,000 1,500,000
Opening balance, Amount $ 203,700,538 $ 201,725,396 $ 263,827,113
Shares issued, Amount 1,273,611,058 785,537,645 888,213,089
Shares redeemed, Amount (1,089,370,082) (765,542,887) (960,031,281)
Adjustment to period Shares due to currency movement and other, Amount (30,713,473) (18,019,616) 9,716,475
Ending balance, Amount $ 357,228,041 $ 203,700,538 $ 201,725,396