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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities    
Cash received for accrued income $ 2,426,804 $ 2,662,377
Cash paid for expenses (1,753,315) (2,035,981)
Net cash provided by operating activities 673,489 626,396
Cash flows from financing activities    
Cash received to purchase redeemable shares 4,917,875 643,041,542
Cash paid to redeem redeemable shares (118,035,488) (308,865,348)
Cash paid for distributions (655,057) (648,924)
Net cash (used in)/provided by financing activities (113,772,670) 333,527,270
Adjustment to period cash flows due to currency movement (6,721,619) 47,767,002
(Decrease)/Increase in cash (119,820,800) 381,920,668
Cash at beginning of period 635,703,495 571,642,324
Cash at end of period 515,882,695 953,562,992
Reconciliation of net income to net cash provided by operating activities    
Net income 604,326 751,514
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (236,069) (501,856)
Prior period receivable from accrued interest 360,153 242,867
Currency translation adjustment (406) 2,604
Accrued sponsor fee 177,939 329,013
Prior period accrued sponsor fee (232,454) (197,746)
Net cash provided by operating activities $ 673,489 $ 626,396