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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Cash flows from operating activities    
Cash received for accrued income $ 1,327,099 $ 1,663,795
Cash paid for expenses (978,603) (1,207,218)
Net cash provided by operating activities 348,496 456,577
Cash flows from financing activities    
Cash received to purchase redeemable shares 19,783,211 4,933,491
Cash paid to redeem redeemable shares (64,297,605) (64,137,745)
Cash paid for distributions (344,567) (442,576)
Net cash used in financing activities (44,858,961) (59,646,830)
Adjustment to period cash flows due to currency movement (3,084,572) 2,221,066
Decrease in cash (47,595,037) (56,969,187)
Cash at beginning of period 492,456,362 635,703,495
Cash at end of period 444,861,325 578,734,308
Reconciliation of net income to net cash provided by operating activities    
Net Income 364,509 373,606
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (217,996) (233,740)
Prior period receivable from accrued interest 223,499 360,153
Currency translation adjustment 56 78
Accrued sponsor fee 148,220 188,934
Prior period accrued sponsor fee (169,792) (232,454)
Net cash provided by operating activities $ 348,496 $ 456,577