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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 0 $ 0  
Cash paid for expenses     (1,407,108) (1,704,848)  
Net cash used in operating activities     (1,407,108) (1,704,848)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     832,272,473 1,050,948,694  
Cash paid to redeem redeemable shares     (779,828,591) (1,072,721,397)  
Net cash provided by/(used in) financing activities     52,443,882 (21,772,703)  
Adjustment to period cash flows due to currency movement     24,459,776 4,167,824  
Increase/(Decrease) in cash     75,496,550 (19,309,727)  
Cash at beginning of period     266,705,058 357,376,987 $ 357,376,987
Cash at end of period $ 342,201,608 $ 338,067,260 342,201,608 338,067,260 $ 266,705,058
Reconciliation of net loss to net cash used in operating activities:          
Net Loss $ (630,407) $ (548,113) (1,503,153) (1,751,814)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     (13,310) (6,247)  
Accrued sponsor fee     128,705 98,363  
Accrued interest expense     133,902 103,796  
Prior period accrued sponsor fee     (75,126) (100,209)  
Prior period accrued interest expense     (78,126) (48,737)  
Net cash used in operating activities     $ (1,407,108) $ (1,704,848)