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Statements Of Cash Flows (USD $)
 9 Months Ended 12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Oct. 31, 2010
Cash flows from operating activities      
Cash received for accrued income $ 2,662,377 $ 12,238  
Cash paid for expenses (2,035,981) (1,756,317)  
Net cash provided by/(used in) operating activities 626,396 (1,744,079)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 643,041,542 186,530,392  
Cash paid to redeem redeemable shares (308,865,348) (157,816,238)  
Cash paid for distributions (648,924)    
Net cash provided by financing activities 333,527,270 28,714,154  
Adjustment to period cash flows due to currency movement 47,767,002 25,987,097  
Increase in cash 381,920,668 52,957,172  
Cash at beginning of period 571,642,324 560,327,680 560,327,680
Cash at end of period 953,562,992 613,284,852 571,642,324
Reconciliation of net income/(loss) to net cash provided by/(used in) operating activities      
Net income/(loss) 751,514 (1,712,797) (1,719,630)
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:      
Receivable from accrued interest (501,856) (57,705)  
Prior period receivable from accrued interest 242,867    
Currency translation adjustment 2,604 (7,472)  
Accrued sponsor fee 329,013 210,120  
Prior period accrued sponsor fee (197,746) (176,225)  
Net cash provided by/(used in) operating activities $ 626,396 $ (1,744,079)