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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 9 Months Ended 12 Months Ended
Jul. 31, 2013
Oct. 31, 2012
Changes In Redeemable Capital Shares [Abstract]    
Opening balance, Shares 2,050,000 1,850,000
Shares issued, Shares 5,800,000 12,850,000
Shares redeemed, Shares (6,300,000) (12,650,000)
Adjustment to period shares due to currency movement and other, Shares      
Ending balance, Shares 1,550,000 2,050,000
Opening balance, Amount $ 263,827,113 $ 257,096,734
Shares issued, Amount 752,709,676 1,652,638,909
Shares redeemed, Amount (817,575,907) (1,626,832,329)
Adjustment to period Shares due to currency movement and other, Amount 4,841,391 (19,076,201)
Ending balance, Amount $ 203,802,273 $ 263,827,113