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Statements of Cash Flows (USD $)
 9 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Cash flows from operating activities    
Cash received for accrued income $ 1,972,536 $ 2,426,804
Cash paid for expenses (1,403,582) (1,753,315)
Net cash provided by operating activities 568,954 673,489
Cash flows from financing activities    
Cash received to purchase redeemable shares 39,224,283 4,917,875
Cash paid to redeem redeemable shares (147,095,701) (118,035,488)
Cash paid for distributions (559,097) (655,057)
Net cash used in financing activities (108,430,515) (113,772,670)
Adjustment to period cash flows due to currency movement (12,212,402) (6,721,619)
Decrease in cash (120,073,963) (119,820,800)
Cash at beginning of period 492,456,362 635,703,495
Cash at end of period 372,382,399 515,882,695
Reconciliation of net income to net cash provided by operating activities    
Net Income 587,996 604,326
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (203,827) (236,069)
Prior period receivable from accrued interest 223,499 360,153
Currency translation adjustment (693) (406)
Accrued sponsor fee 131,771 177,939
Prior period accrued sponsor fee (169,792) (232,454)
Net cash provided by operating activities $ 568,954 $ 673,489