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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 859 $ 359,347  
Cash paid for expenses (205,283) (240,388)  
Net cash (used in)/provided by operating activities (204,424) 118,959  
Cash flows from financing activities      
Cash received to purchase redeemable shares 7,223,828 46,961,005  
Cash paid to redeem redeemable shares (7,225,842) (68,305,840)  
Cash paid for distributions   (117,086)  
Net cash used in financing activities (2,014) (21,461,921)  
Adjustment to period cash flows due to currency movement (15,199,397) (26,114,742)  
Decrease in cash (15,405,835) (47,457,704)  
Cash at beginning of period 216,342,962 251,358,346 $ 251,358,346
Cash at end of period 200,937,127 203,900,642 $ 216,342,962
Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities      
Net (Loss)/Income (204,479) 87,117  
Adjustments to reconcile net (loss)/income to net cash (used in)/provided by operating activities:      
Receivable from accrued interest   (90,118)  
Prior period receivable from accrued interest   142,463  
Currency translation adjustment 5,165 (3,682)  
Accrued sponsor fee 68,375 69,018  
Prior period accrued sponsor fee (73,485) (85,839)  
Net cash (used in)/provided by operating activities $ (204,424) $ 118,959