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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Cash flows from operating activities    
Cash received for accrued income $ 1,379,718 $ 1,972,536
Cash paid for expenses (877,352) (1,403,582)
Net cash provided by operating activities 502,366 568,954
Cash flows from financing activities    
Cash received to purchase redeemable shares 36,663,447 39,224,283
Cash paid to redeem redeemable shares (96,241,993) (147,095,701)
Cash paid for distributions (494,023) (559,097)
Net cash used in financing activities (60,072,569) (108,430,515)
Adjustment to period cash flows due to currency movement (14,040,917) (12,212,402)
Decrease in cash (73,611,120) (120,073,963)
Cash at beginning of period 338,495,100 492,456,362
Cash at end of period 264,883,980 372,382,399
Reconciliation of net income to net cash provided by operating activities    
Net Income 493,678 587,996
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (140,191) (203,827)
Prior period receivable from accrued interest 177,335 223,499
Currency translation adjustment (3,276) (693)
Accrued sponsor fee 90,298 131,771
Prior period accrued sponsor fee (115,478) (169,792)
Net cash provided by operating activities $ 502,366 $ 568,954