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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Oct. 31, 2012
Cash flows from operating activities      
Cash received for accrued income $ 677,331 $ 927,527  
Cash paid for expenses (510,430) (624,149)  
Net cash provided by operating activities 166,901 303,378  
Cash flows from financing activities      
Cash received to purchase redeemable shares 20,016,166    
Cash paid to redeem redeemable shares (25,020,438) (43,828,778)  
Cash paid for distributions (165,574) (291,045)  
Net cash used in financing activities (5,169,846) (44,119,823)  
Adjustment to period cash flows due to currency movement 346,761 (6,878,418)  
Decrease in cash (4,656,184) (50,694,863)  
Cash at beginning of period 492,456,362 635,703,495 635,703,495
Cash at end of period 487,800,178 585,008,632 492,456,362
Reconciliation of net income to net cash provided by operating activities      
Net Income 169,088 228,668 731,964
Adjustments to reconcile net income to net cash provided by operating activities:      
Receivable from accrued interest (222,357) (248,629)  
Prior period receivable from accrued interest 223,499 360,153  
Currency translation adjustment 24 (2,575)  
Accrued sponsor fee 166,439 198,215  
Prior period accrued sponsor fee (169,792) (232,454)  
Net cash provided by operating activities $ 166,901 $ 303,378