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Statements of Cash Flows (USD $)
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Cash flows from operating activities      
Cash received for accrued income $ 3,088,776 $ 4,040,326 $ 405,529
Cash paid for expenses (2,281,264) (2,998,190) (2,355,834)
Net cash provided by/(used in) operating activities 807,512 1,042,136 (1,950,305)
Cash flows from financing activities      
Cash received to purchase redeemable shares 14,846,422 775,887,155 249,212,202
Cash paid to redeem redeemable shares (153,417,420) (725,504,395) (268,320,490)
Cash paid for distributions (787,686) (1,055,793) (15,997)
Net cash (used in)/provided by financing activities (139,358,684) 49,326,967 (19,124,285)
Adjustment to period cash flows due to currency movement (4,695,961) 13,692,068 32,389,234
(Decrease)/Increase in cash (143,247,133) 64,061,171 11,314,644
Cash at beginning of year 635,703,495 571,642,324 560,327,680
Cash at end of year 492,456,362 635,703,495 571,642,324
Reconciliation of net income/(loss) to net cash provided by/(used in) operating activities      
Net Income/(Loss) 731,964 1,126,346 (1,719,630)
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:      
Receivable from accrued interest (223,499) (360,153) (242,867)
Prior period receivable from accrued interest 360,153 242,867   
Currency translation adjustment 1,556 (1,632) (9,329)
Accrued sponsor fee 169,792 232,454 197,746
Prior period accrued sponsor fee (232,454) (197,746) (176,225)
Net cash provided by/(used in) operating activities $ 807,512 $ 1,042,136 $ (1,950,305)