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Investment in Gold - Investment in Gold (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
oz
Jun. 30, 2013
Jun. 30, 2014
oz
Jun. 30, 2013
oz
Sep. 30, 2013
oz
Ounces of Gold:          
Opening balance     29,244,400 42,803,600 42,803,600
Creations (excluding gold receivable at June 30, 2014 - 182.9 and at September 30, 2013 - 0)     3,219,200   4,944,800
Redemptions (excluding gold payable at June 30, 2014 - 0 and at September 30, 2013 - 115.9)     (7,145,500)   (18,348,000)
Sales of gold     (79,100)   (156,000)
Closing balance 25,239,000   25,239,000   29,244,400
Investment in Gold (lower of cost or market):          
Opening balance     $ 35,812,777 [1],[2] $ 50,726,261 $ 50,726,261
Creations (excluding gold receivable at June 30, 2014 - $240,490 and at September 30, 2013 - $0)     4,166,969   7,734,465
Redemptions (excluding gold payable at June 30, 2014 - $0 and at September 30, 2013 - $153,680)     (8,778,258)   (22,459,232)
Sales of gold (31,419) (47,545) (97,046) (149,113) (188,717)
Unrealized loss on investment in Gold 0 840,230 0 840,230 0
Closing balance $ 31,104,442 [2]   $ 31,104,442 [2]   $ 35,812,777 [1],[2]
[1] Derived from audited statement of financial condition as of September 30, 2013.
[2] The market value of Investment in Gold at June 30, 2014 is $33,189,337 and at September 30, 2013 was $38,792,631.