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Statements Of Cash Flows (USD $)
 12 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2009
Cash flows from operating activities      
Cash received for accrued income $ 2,164,103 $ 582,467 $ 7,480,322
Cash paid for expenses (1,564,368) (2,301,142) (2,402,522)
Net cash provided by/(used in) operating activities 599,735 (1,718,675) 5,077,800
Cash flows from financing activities      
Cash received to purchase redeemable shares 3,532,613,866 2,527,532,186 553,905,548
Cash paid to redeem redeemable shares (3,740,850,452) (2,614,731,248) (588,099,632)
Cash paid for distributions (655,797)   (4,922,939)
Net cash used in financing activities (208,892,383) (87,199,062) (39,117,023)
Adjustment to period cash flows due to currency movement 1,424,747 (36,893,537) 85,278,433
(Decrease)/ Increase in cash (206,867,901) (125,811,274) 51,239,210
Cash at beginning of year 463,876,102 589,687,376 538,448,166
Cash at end of year 257,008,201 463,876,102 589,687,376
Reconciliation of net income/(loss) to net cash provided by/(used in) operating activities      
Net income/(loss) 675,520 (1,559,154) 2,535,812
Adjustments to reconcile net income/(loss) to net cash used in operating activities:      
Receivable from accrued interest (195,055) (167,448) (42,662)
Prior period receivable from accrued interest 167,448 42,662 2,325,782
Currency translation adjustment (15,617) 21,725 303,465
Accrued sponsor fee 106,522 139,083 195,543
Prior period accrued sponsor fee (139,083) (195,543) (240,140)
Net cash provided by/(used in) operating activities $ 599,735 $ (1,718,675) $ 5,077,800