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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Oct. 31, 2012
Cash flows from operating activities      
Cash received for accrued income   $ 467,751  
Cash paid for expenses (262,524) (368,027)  
Net cash (used in)/provided by operating activities (262,524) 99,724  
Cash flows from financing activities      
Cash received to purchase redeemable shares 279,061,873 729,729,837  
Cash paid to redeem redeemable shares (311,522,484) (683,694,866)  
Cash paid for distributions   (104,566)  
Net cash (used in)/provided by financing activities (32,460,611) 45,930,405  
Adjustment to period cash flows due to currency movement 11,306,404 (16,182,200)  
(Decrease)/Increase in cash (21,416,731) 29,847,929  
Cash at beginning of period 263,931,355 257,008,201 257,008,201
Cash at end of period 242,514,624 286,856,130 263,931,355
Reconciliation of net loss to net cash used in/provided by operating activities      
Net Loss (248,127) (56,394) (790,317)
Adjustments to reconcile net loss to net cash used in/provided by operating activities:      
Receivable from accrued interest   (31,355)  
Prior period receivable from accrued interest   195,055  
Currency translation adjustment (4,410) (4,148)  
Accrued sponsor fee 94,255 103,088  
Prior period accrued sponsor fee (104,242) (106,522)  
Net cash (used in)/provided by operating activities $ (262,524) $ 99,724