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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0  
Cash paid for expenses (423,425) (654,022)  
Net cash used in operating activities (423,425) (654,022)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 113,802,763 721,165,372  
Cash paid to redeem redeemable shares (170,775,940) (752,798,387)  
Net cash used in financing activities (56,973,177) (31,633,015)  
Adjustment to period cash flows due to currency movement (4,622,787) (7,292,323)  
Decrease in cash (62,019,389) (39,579,360)  
Cash at beginning of period 266,705,058 357,376,987 $ 357,376,987
Cash at end of period 204,685,669 317,797,627 $ 266,705,058
Reconciliation of net loss to net cash used in operating activities      
Net Loss (407,280) (688,737)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 2,406 3,067  
Accrued sponsor fee 66,642 108,568  
Accrued interest expense 68,059 72,026  
Prior period accrued sponsor fee (75,126) (100,209)  
Prior period accrued interest expense (78,126) (48,737)  
Net cash used in operating activities $ (423,425) $ (654,022)