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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities    
Cash received for accrued income $ 578,592 $ 1,491,643
Cash paid for expenses (903,566) (1,188,168)
Net cash (used in)/provided by operating activities (324,974) 303,475
Cash flows from financing activities    
Cash received to purchase redeemable shares 1,421,436,131 2,511,700,133
Cash paid to redeem redeemable shares (1,376,198,165) (2,643,533,245)
Cash paid for distributions (102,821) (408,208)
Net cash provided by/(used in) financing activities 45,135,145 (132,241,320)
Adjustment to period cash flows due to currency movement (32,373,781) 11,557,772
Increase/(Decrease) in cash 12,436,390 (120,380,073)
Cash at beginning of period 257,008,201 463,876,102
Cash at end of period 269,444,591 343,496,029
Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities    
Net (Loss)/Income (489,333) 420,644
Adjustments to reconcile net (loss)/income to net cash used in operating activities:    
Receivable from accrued interest (3,999) (282,819)
Prior period receivable from accrued interest 195,055 167,448
Currency translation adjustment (5,428) (11,520)
Accrued sponsor fee 85,253 148,805
Prior period accrued sponsor fee (106,522) (139,083)
Net cash (used in)/provided by operating activities $ (324,974) $ 303,475