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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0  
Cash paid for expenses (654,022) (217,339)  
Net cash used in operating activities (654,022) (217,339)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 721,165,372 388,270,228  
Cash paid to redeem redeemable shares (752,798,387) (292,762,502)  
Net cash (used in)/provided by financing activities (31,633,015) 95,507,726  
Adjustment to period cash flows due to currency movement (7,292,323) (28,124,396)  
(Decrease)/Increase in cash (39,579,360) 67,165,991  
Cash at beginning of period 357,376,987 216,126,592 $ 216,126,592
Cash at end of period 317,797,627 283,292,583 $ 357,376,987
Reconciliation of net loss to net cash used in operating activities      
Net Loss (688,737) (211,125)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 3,067 7,598  
Accrued sponsor fee 108,568 60,504  
Accrued interest expense 72,026 6,538  
Prior period accrued sponsor fee (100,209) (78,416)  
Prior period accrued interest expense (48,737) (2,438)  
Net cash used in operating activities $ (654,022) $ (217,339)