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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Cash flows from operating activities      
Cash received for accrued income     $ 20,758
Cash paid for expenses $ (2,247,862) $ (1,441,202) (848,295)
Net cash used in operating activities (2,247,862) (1,441,202) (827,537)
Cash flows from financing activities      
Cash received to purchase redeemable shares 1,198,371,197 1,273,611,058 792,208,558
Cash paid to redeem redeemable shares (1,285,096,408) (1,100,566,383) (752,253,746)
Net cash (used in)/provided by financing activities (86,725,211) 173,044,675 39,954,812
Adjustment to period cash flows due to currency movement (1,698,856) (30,353,078) (18,075,087)
(Decrease)/Increase in cash (90,671,929) 141,250,395 21,052,188
Cash at beginning of year 357,376,987 216,126,592 195,074,404
Cash at end of year 266,705,058 357,376,987 216,126,592
Reconciliation of net loss to net cash used in operating activities      
Net Loss (2,249,106) (1,505,472) (841,247)
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment (3,062) (3,822) 6,191
Accrued sponsor fee 75,126 100,209 78,416
Accrued interest expense 78,126 48,737 2,438
Prior period accrued sponsor fee (100,209) (78,416) (73,335)
Prior period accrued interest expense (48,737) (2,438)  
Net cash used in operating activities $ (2,247,862) $ (1,441,202) $ (827,537)