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Statements of Cash Flows (USD $)
 6 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Cash flows from operating activities    
Cash received for accrued income $ 746,348 $ 239,423
Cash paid for expenses (804,292) (1,220,358)
Net cash used in operating activities (57,944) (980,935)
Cash flows from financing activities    
Cash received to purchase redeemable shares 1,469,534,119 477,506,551
Cash paid to redeem redeemable shares (1,585,729,481) (449,332,796)
Cash paid for distributions (26,138)  
Net cash (used in)/provided by financing activities (116,221,500) 28,173,755
Adjustment to period cash flows due to currency movement 21,847,477 (59,752,643)
Decrease in cash (94,431,967) (32,559,823)
Cash at beginning of period 463,876,102 589,687,376
Cash at end of period 369,444,135 557,127,553
Reconciliation of net income/(loss) to net cash used in operating activities    
Net income/(loss) 14,447 (1,002,252)
Adjustments to reconcile net income/(loss) to net cash used in operating activities:    
Receivable from accrued interest (230,346) (38,075)
Prior period receivable from accrued interest 167,448 42,662
Currency translation adjustment 3,099 13,872
Accrued sponsor fee 126,491 198,401
Prior period accrued sponsor fee (139,083) (195,543)
Net cash used in operating activities $ (57,944) $ (980,935)