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Significant Accounting Policies - Creations and Redemptions of Shares (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Number of redeemable shares:    
Opening balance 301,600,000 437,900,000
Creations 35,300,000 51,100,000
Redemptions (72,900,000) (187,400,000)
Closing balance 264,000,000 301,600,000
Redeemable Shares:    
Opening balance $ 38,623,537 [1],[2] $ 75,389,813
Creations 4,407,459 7,734,465
Redemptions (8,950,053) (26,693,165)
Adjustment to redemption value (665,464) (17,807,576)
Closing balance $ 33,415,479 [2] $ 38,623,537 [1],[2]
Redemption value per redeemable share at period end $ 126.57 $ 128.06
[1] Derived from audited statement of financial condition as of September 30, 2013.
[2] Authorized share capital is unlimited and the par value of the Shares is $0.00. Shares issued and outstanding at June 30, 2014 was 264,000,000 and at September 30, 2013 was 301,600,000.