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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Oct. 31, 2014
Cash flows from operating activities          
Cash received for accrued income     $ 715,081 $ 1,379,718  
Cash paid for expenses     (646,886) (877,352)  
Net cash provided by operating activities     68,195 502,366  
Cash flows from financing activities          
Cash received to purchase redeemable shares     101,873,544 36,663,447  
Cash paid to redeem redeemable shares     (101,885,222) (96,241,993)  
Cash paid for distributions     (135,495) (494,023)  
Net cash used in financing activities     (147,173) (60,072,569)  
Adjustment to period cash flows due to currency movement     (33,517,260) (14,040,917)  
Decrease in cash     (33,596,238) (73,611,120)  
Cash at beginning of period     251,358,346 338,495,100 $ 338,495,100
Cash at end of period $ 217,762,108 $ 264,883,980 217,762,108 264,883,980 $ 251,358,346
Reconciliation of net (loss)/income to net cash provided by operating activities          
Net (Loss)/Income $ (65,044) $ 157,359 (25,506) 493,678  
Adjustments to reconcile net (loss)/income to net cash provided by operating activities:          
Receivable from accrued interest     (28,213) (140,191)  
Prior period receivable from accrued interest     142,463 177,335  
Currency translation adjustment     (7,848) (3,276)  
Accrued sponsor fee     73,138 90,298  
Prior period accrued sponsor fee     (85,839) (115,478)  
Net cash provided by operating activities     $ 68,195 $ 502,366