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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 0 $ 0  
Cash paid for expenses     (1,181,426) (478,115)  
Net cash used in operating activities     (1,181,426) (478,115)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     830,092,169 830,979,925  
Cash paid to redeem redeemable shares     (926,851,318) (739,975,772)  
Net cash (used in)/provided by financing activities     (96,759,149) 91,004,153  
Adjustment to period cash flows due to currency movement     9,203,395 (25,659,803)  
(Decrease)/Increase in cash     (88,737,180) 64,866,235  
Cash at beginning of period     357,376,987 216,126,592 $ 216,126,592
Cash at end of period $ 268,639,807 $ 280,992,827 268,639,807 280,992,827 $ 357,376,987
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (514,964) $ (319,395) (1,203,701) (530,520)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     (9,560) 3,282  
Accrued sponsor fee     93,859 86,326  
Accrued interest expense     86,922 43,651  
Prior period accrued sponsor fee     (100,209) (78,416)  
Prior period accrued interest expense     (48,737) (2,438)  
Net cash used in operating activities     $ (1,181,426) $ (478,115)