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Statements Of Cash Flows (USD $)
 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities    
Cash received for accrued income $ 1,663,795 $ 1,540,388
Cash paid for expenses (1,207,218) (1,224,381)
Net cash provided by operating activities 456,577 316,007
Cash flows from financing activities    
Cash received to purchase redeemable shares 4,933,491 211,064,261
Cash paid to redeem redeemable shares (64,137,745) (95,482,281)
Cash paid for distributions (442,576) (318,721)
Net cash (used in)/provided by financing activities (59,646,830) 115,263,259
Adjustment to period cash flows due to currency movement 2,221,066 46,358,380
(Decrease)/Increase in cash (56,969,187) 161,937,646
Cash at beginning of period 635,703,495 571,642,324
Cash at end of period 578,734,308 733,579,970
Reconciliation of net income to net cash provided by operating activities    
Net income 373,606 346,608
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (233,740) (316,425)
Prior period receivable from accrued interest 360,153 242,867
Currency translation adjustment 78 3,989
Accrued sponsor fee 188,934 236,714
Prior period accrued sponsor fee (232,454) (197,746)
Net cash provided by operating activities $ 456,577 $ 316,007