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Statements of Cash Flows (USD $)
 12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Cash flows from operating activities      
Cash received for accrued income   $ 580,198 $ 2,164,103
Cash paid for expenses (974,759) (1,190,089) (1,564,368)
Net cash (used in)/provided by operating activities (974,759) (609,891) 599,735
Cash flows from financing activities      
Cash received to purchase redeemable shares 881,695,938 1,652,638,909 3,532,613,866
Cash paid to redeem redeemable shares (960,031,281) (1,626,832,329) (3,740,850,452)
Cash paid for distributions   (102,361) (655,797)
Net cash (used in)/provided by financing activities (78,335,343) 25,704,219 (208,892,383)
Adjustment to period cash flows due to currency 10,453,151 (18,171,174) 1,424,747
(Decrease)/Increase in cash (68,856,951) 6,923,154 (206,867,901)
Cash at beginning of year 263,931,355 257,008,201 463,876,102
Cash at end of year 195,074,404 263,931,355 257,008,201
Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities      
Net (Loss)/Income (939,137) (790,317) 675,520
Adjustments to reconcile net (loss)/income to net cash (used in)/provided by operating activities:      
Receivable from accrued interest     (195,055)
Prior period receivable from accrued interest   195,055 167,448
Currency translation adjustment (4,715) (12,349) (15,617)
Accrued sponsor fee 73,335 104,242 106,522
Prior period accrued sponsor fee (104,242) (106,522) (139,083)
Net cash (used in)/provided by operating activities $ (974,759) $ (609,891) $ 599,735