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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     $ 1,775 $ 551,937  
Cash paid for expenses     (419,618) (437,219)  
Net cash (used in)/provided by operating activities     (417,843) 114,718  
Cash flows from financing activities          
Cash received to purchase redeemable shares     14,684,858 82,422,356  
Cash paid to redeem redeemable shares     (18,351,127) (98,913,676)  
Cash paid for distributions       (137,022)  
Net cash used in financing activities     (3,666,269) (16,628,342)  
Adjustment to period cash flows due to currency movement     9,307,708 (17,324,036)  
Increase/(Decrease) in cash     5,223,596 (33,837,660)  
Cash at beginning of period     216,342,962 251,358,346 $ 251,358,346
Cash at end of period $ 221,566,558 $ 217,520,686 221,566,558 217,520,686 $ 216,342,962
Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities          
Net (Loss)/Income $ (210,724) $ (47,579) (415,203) 39,538  
Adjustments to reconcile net (loss)/income to net cash (used in)/provided by operating activities:          
Receivable from accrued interest       (39,339)  
Prior period receivable from accrued interest       142,463  
Currency translation adjustment     (2,869) (8,308)  
Accrued sponsor fee     73,714 66,203  
Prior period accrued sponsor fee     (73,485) (85,839)  
Net cash (used in)/provided by operating activities     $ (417,843) $ 114,718