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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 paid for expenses $ (188,474) $ (96,299)  
Net cash used in operating activities (188,474) (96,299)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 292,616,395 251,339,789  
Cash paid to redeem redeemable shares (124,251,919) (189,541,270)  
Net cash provided by financing activities 168,364,476 61,798,519  
Adjustment to period cash flows due to currency movement (658,527) (3,441,164)  
Increase in cash 167,517,475 58,261,056  
Cash at beginning of period 128,613,360 82,529,967 $ 82,529,967
Cash at end of period 296,130,835 140,791,023 $ 128,613,360
Reconciliation of net loss to net cash used in operating activities      
Net Loss (216,290) (103,675)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 187 1,236  
Accrued sponsor fee 73,032 34,078  
Prior period accrued sponsor fee (45,403) (27,938)  
Net cash used in operating activities $ (188,474) $ (96,299)