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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 0 $ 0  
Cash paid for expenses     (1,991,351) (1,407,108)  
Net cash used in operating activities     (1,991,351) (1,407,108)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     501,801,746 832,272,473  
Cash paid to redeem redeemable shares     (617,121,663) (779,828,591)  
Net cash (used in)/provided by financing activities     (115,319,917) 52,443,882  
Adjustment to period cash flows due to currency movement     4,434,157 24,459,776  
(Decrease)/Increase in cash     (112,877,111) 75,496,550  
Cash at beginning of period     376,734,108 266,705,058 $ 266,705,058
Cash at end of period $ 263,856,997 $ 342,201,608 263,856,997 342,201,608 $ 376,734,108
Reconciliation of net loss to net cash used in operating activities:          
Net Loss $ (623,423) $ (630,407) (1,958,901) (1,503,153)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     311 (13,310)  
Accrued Sponsor's fee     91,823 128,705  
Accrued interest expense     93,507 133,902  
Prior period accrued Sponsor's fee     (108,181) (75,126)  
Prior period accrued interest expense     (109,910) (78,126)  
Net cash used in operating activities     $ (1,991,351) $ (1,407,108)