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Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 10 Months Ended 12 Months Ended
Jul. 17, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jul. 16, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Schedule Of Significant Accounting Policies [Line Items]                          
Maximum number of business days within which ownership of the gold is transferred                     3 days    
Minimum denomination of shares issued redeemed against gold                     100,000    
Net realized and change in unrealized gain/(loss) on investment in gold   $ (1,330,874,000) $ (347,521,000) $ (455,804,000) $ (440,989,000)           $ (2,575,188,000) [1]    
Net realized gain/(loss) from investment in gold sold to pay expenses   (2,691,000) (765,000) (815,000) (899,000)           (5,170,000) [1]    
Net realized gain/(loss) from gold distributed for the redemption of shares   (214,791,000) (65,606,000) (59,785,000) (106,862,000)           (447,044,000) [1]    
Net change in unrealized appreciation/(depreciation) on investment in gold   (1,113,392,000) $ (281,150,000) $ (395,204,000) $ (333,228,000) $ (477,254,000) $ 0 $ 603,341,000 $ (603,341,000)   (2,122,974,000) [1] $ (477,254,000)  
Total gain/(loss) on gold           (426,901,000) 100,567,000 695,938,000 (466,234,000)     (96,630,000) $ 4,735,252,000
Gain on gold sold to pay expenses           1,506,000 1,572,000 2,024,000 1,200,000     6,302,000 52,407,000
Gain on gold distributed for the redemption of shares           48,847,000 $ 98,995,000 $ 90,573,000 $ 135,907,000     374,322,000 $ 4,682,845,000
Liability for uncertain tax positions - current   $ 0       $ 0         $ 0 $ 0  
Sponsor [Member]                          
Schedule Of Significant Accounting Policies [Line Items]                          
Related party fees payable at annual rate 0.40%                 0.15%      
[1] Effective October 1, 2014, the Trust adopted the financial presentation provisions for an investment company. See note 2.2 to our audited financial statements.