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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Changes In Redeemable Capital Shares [Abstract]      
Opening balance, Shares 2,050,000 1,850,000 2,800,000
Shares issued, Shares 6,800,000 12,850,000 25,450,000
Shares redeemed, Shares (7,350,000) (12,650,000) (26,400,000)
Adjustment to period shares due to currency movement and other, Shares         
Ending balance, Shares 1,500,000 2,050,000 1,850,000
Opening balance, Amount $ 263,827,113 $ 257,096,734 $ 387,741,044
Shares issued, Amount 888,213,089 1,652,638,909 3,532,613,866
Shares redeemed, Amount (960,031,281) (1,626,832,329) (3,664,496,177)
Adjustment to period Shares due to currency movement and other, Amount 9,716,475 (19,076,201) 1,238,001
Ending balance, Amount $ 201,725,396 $ 263,827,113 $ 257,096,734