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Significant Accounting Policies - Creations and Redemptions of Shares (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Number of Redeemable Shares:      
Opening balance 406,800,000 429,200,000 358,900,000
Creations 84,700,000 115,600,000 114,000,000
Redemptions (53,600,000) (138,000,000) (43,700,000)
Closing balance 437,900,000 406,800,000 429,200,000
Redeemable Shares:      
Opening balance $ 64,137,833 [1] $ 54,809,779 $ 35,054,043
Creations 13,956,415 17,521,097 13,221,048
Redemptions (8,456,437) (20,567,866) (5,023,591)
Adjustment to redemption value 5,752,002 12,374,823 11,558,279
Closing balance $ 75,389,813 [1] $ 64,137,833 [1] $ 54,809,779
Redemption value per redeemable share at period end $ 172.16 $ 157.66 $ 127.70
[1] Authorized share capital is unlimited and shares par value is $0.00. Shares issued and outstanding at September 30, 2012 is 437,900,000 and at September 30, 2011 is 406,800,000.