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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities    
Cash received for accrued income $ 543,433 $ 746,348
Cash paid for expenses (659,177) (804,292)
Net cash used in operating activities (115,744) (57,944)
Cash flows from financing activities    
Cash received to purchase redeemable shares 1,064,770,149 1,469,534,119
Cash paid to redeem redeemable shares (1,018,753,958) (1,585,729,481)
Cash paid for distributions (104,564) (26,138)
Net cash provided by/(used in) financing activities 45,911,627 (116,221,500)
Adjustment to period cash flows due to currency movement (13,004,517) 21,847,477
Increase/(Decrease) in cash 32,791,366 (94,431,967)
Cash at beginning of period 257,008,201 463,876,102
Cash at end of period 289,799,567 369,444,135
Reconciliation of net (loss)/income to net cash used in operating activities    
Net (Loss)/Income (259,277) 14,447
Adjustments to reconcile net (loss)/income to net cash used in operating activities:    
Receivable from accrued interest (14,221) (230,346)
Prior period receivable from accrued interest 195,055 167,448
Currency translation adjustment (4,915) 3,099
Accrued sponsor fee 74,136 126,491
Prior period accrued sponsor fee (106,522) (139,083)
Net cash used in operating activities $ (115,744) $ (57,944)