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Condensed Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Shareholders' Deficit - Opening balance     $ (2,979,854) [1]    
Net gain for the period 67,953 959,073 229,495 3,443,689  
Adjustment of redeemable shares to redemption value     665,464   17,807,576
Shareholders' Deficit - Closing balance $ (2,084,895)   $ (2,084,895)   $ (2,979,854) [1]
[1] Derived from audited statement of financial condition as of September 30, 2013.