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Statements Of Cash Flows (USD $)
 9 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Cash flows from operating activities    
Cash received for accrued income $ 1,491,643 $ 345,773
Cash paid for expenses (1,188,168) (1,789,127)
Net cash provided by/(used in) operating activities 303,475 (1,443,354)
Cash flows from financing activities    
Cash received to purchase redeemable shares 2,511,700,133 1,263,825,914
Cash paid to redeem redeemable shares (2,643,533,245) (1,277,201,175)
Cash paid for distributions (408,208)  
Net cash used in financing activities (132,241,320) (13,375,261)
Adjustment to period cash flows due to currency movement 11,557,772 (68,413,205)
Decrease in cash (120,380,073) (83,231,820)
Cash at beginning of period 463,876,102 589,687,376
Cash at end of period 343,496,029 506,455,556
Reconciliation of net income/(loss) to net cash provided by/(used in) operating activities    
Net income/(loss) 420,644 (1,380,440)
Adjustments to reconcile net income/(loss) to net cash used in operating activities:    
Receivable from accrued interest (282,819) (82,676)
Prior period receivable from accrued interest 167,448 42,662
Currency translation adjustment (11,520) 19,024
Accrued sponsor fee 148,805 153,619
Prior period accrued sponsor fee (139,083) (195,543)
Net cash provided by/(used in) operating activities $ 303,475 $ (1,443,354)