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Statements Of Cash Flows (USD $)
 3 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Cash flows from operating activities    
Cash received for accrued income $ 927,527 $ 758,180
Cash paid for expenses (624,149) (605,518)
Net cash provided by operating activities 303,378 152,662
Cash flows from financing activities    
Cash received to purchase redeemable shares   89,070,841
Cash paid to redeem redeemable shares (43,828,778) (69,278,250)
Cash paid for distributions (291,045) (150,933)
Net cash (used in)/provided by financing activities (44,119,823) 19,641,658
Adjustment to period cash flows due to currency movement (6,878,418) 10,005,557
(Decrease)/Increase in cash (50,694,863) 29,799,877
Cash at beginning of period 635,703,495 571,642,324
Cash at end of period 585,008,632 601,442,201
Reconciliation of net income to net cash provided by operating activities    
Net income 228,668 157,677
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (248,629) (250,649)
Prior period receivable from accrued interest 360,153 242,867
Currency translation adjustment (2,575) 805
Accrued sponsor fee 198,215 199,708
Prior period accrued sponsor fee (232,454) (197,746)
Net cash provided by operating activities $ 303,378 $ 152,662