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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 0 $ 0  
Cash paid for expenses     (853,452) (1,181,426)  
Net cash used in operating activities     (853,452) (1,181,426)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     434,736,142 830,092,169  
Cash paid to redeem redeemable shares     (414,238,526) (926,851,318)  
Net cash provided by/(used in) financing activities     20,497,616 (96,759,149)  
Adjustment to period cash flows due to currency movement     (1,354,313) 9,203,395  
Increase/(Decrease) in cash     18,289,851 (88,737,180)  
Cash at beginning of period     266,705,058 357,376,987 $ 357,376,987
Cash at end of period $ 284,994,909 $ 268,639,807 284,994,909 268,639,807 $ 266,705,058
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (465,466) $ (514,964) (872,746) (1,203,701)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     709 (9,560)  
Accrued sponsor fee     86,213 93,859  
Accrued interest expense     85,624 86,922  
Prior period accrued sponsor fee     (75,126) (100,209)  
Prior period accrued interest expense     (78,126) (48,737)  
Net cash used in operating activities     $ (853,452) $ (1,181,426)