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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 $ 467,751 $ 346,332
Cash paid for expenses (368,027) (404,141)
Net cash provided by/(used in) operating activities 99,724 (57,809)
Cash flows from financing activities    
Cash received to purchase redeemable shares 729,729,837 621,144,515
Cash paid to redeem redeemable shares (683,694,866) (681,258,018)
Cash paid for distributions (104,566) (23,548)
Net cash provided by/(used in) financing activities 45,930,405 (60,137,051)
Adjustment to period cash flows due to currency movement (16,182,200) (7,654,081)
Increase/(Decrease) in cash 29,847,929 (67,848,941)
Cash at beginning of period 257,008,201 463,876,102
Cash at end of period 286,856,130 396,027,161
Reconciliation of net loss to net cash used in operating activities    
Net Loss (56,394) (85,851)
Adjustments to reconcile net (loss)/income to net cash (used in)/provided by operating activities:    
Receivable from accrued interest (31,355) (137,960)
Prior period receivable from accrued interest 195,055 167,448
Currency translation adjustment (4,148) (1,013)
Accrued sponsor fee 103,088 138,650
Prior period accrued sponsor fee (106,522) (139,083)
Net cash provided by/(used in) operating activities $ 99,724 $ (57,809)