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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, 2013
Sep. 30, 2012
Sep. 30, 2011
Number of Redeemable Shares:      
Opening balance 437,900,000 406,800,000 429,200,000
Creations 51,100,000 84,700,000 115,600,000
Redemptions (187,400,000) (53,600,000) (138,000,000)
Closing balance 301,600,000 437,900,000 406,800,000
Redeemable Shares:      
Opening balance $ 75,389,813 [1] $ 64,137,833 $ 54,809,779
Creations 7,734,465 13,956,415 17,521,097
Redemptions (26,693,165) (8,456,437) (20,567,866)
Adjustment to redemption value (17,807,576) 5,752,002 12,374,823
Closing balance $ 38,623,537 [1] $ 75,389,813 [1] $ 64,137,833
Redemption value per redeemable share at period end $ 128.06 $ 172.16 $ 157.66
[1] Authorized share capital is unlimited and shares par value is $0.00. Shares issued and outstanding at September 30, 2013 is 301,600,000 and at September 30, 2012 is 437,900,000.