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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 189,205    
Cash paid for expenses (177,847) $ (202,204)  
Net cash provided by/(used in) operating activities 11,358 (202,204)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 15,597,038 11,123,338  
Cash paid to redeem redeemable shares (15,596,356) (22,234,112)  
Cash paid for distributions (14,666)    
Net cash used in financing activities (13,984) (11,110,774)  
Adjustment to period cash flows due to currency movement 8,930,424 5,218,163  
Increase/(Decrease) in cash 8,927,798 (6,094,815)  
Cash at beginning of period 176,006,303 195,609,315 $ 195,609,315
Cash at end of period 184,934,101 189,514,500 $ 176,006,303
Reconciliation of net income/(loss) to net cash provided activities      
Net Income/(Loss) 44,903 (184,495)  
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:      
Receivable from accrued interest (96,792) (16,778)  
Prior period receivable from accrued interest 61,585    
Currency translation adjustment 1,117 (1,424)  
Accrued sponsor fee 60,717 65,787  
Prior period accrued sponsor fee (60,172) (65,294)  
Net cash provided by/(used in) operating activities $ 11,358 $ (202,204)