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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Cash flows from operating activities    
Cash received for accrued income   $ 578,592
Cash paid for expenses (756,831) (903,566)
Net cash used in operating activities (756,831) (324,974)
Cash flows from financing activities    
Cash received to purchase redeemable shares 752,709,676 1,421,436,131
Cash paid to redeem redeemable shares (804,616,454) (1,376,198,165)
Cash paid for distributions   (102,821)
Net cash (used in)/provided by financing activities (51,906,778) 45,135,145
Adjustment to period cash flows due to currency movement 5,759,084 (32,373,781)
(Decrease)/Increase in cash (46,904,525) 12,436,390
Cash at beginning of period 263,931,355 257,008,201
Cash at end of period 217,026,830 269,444,591
Reconciliation of net loss to net cash used in operating activities    
Net Loss (726,391) (489,333)
Adjustments to reconcile net loss to net cash used in operating activities:    
Receivable from accrued interest   (3,999)
Prior period receivable from accrued interest   195,055
Currency translation adjustment (2,077) (5,428)
Accrued sponsor fee 75,879 85,253
Prior period accrued sponsor fee (104,242) (106,522)
Net cash used in operating activities $ (756,831) $ (324,974)