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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Significant Accounting Policies [Line Items]          
Fair value of assets and liabilities, amount transferred between levels     $ 0   $ 0
Maximum number of business days within which gold is transferred from the Fund's allocated bullion account with the Custodian     2 days    
Minimum denomination of shares issued redeemed against gold 100,000        
Net realized and change in unrealized gain/(loss) on investment in gold $ (353,429) $ 160,887 $ 125,138 $ (283,201)  
Net realized gain/(loss) from investment in gold sold to pay Sponsor fees 112 154 382 500  
Net change in unrealized gain/(loss) on investment in gold (363,675) 160,714 85,557 (320,595)  
Net realized gain/(loss) from gold distributed for the redemption of shares 10,134 19 39,199 36,894  
Reserve for uncertain tax positions $ 0   $ 0    
Income tax examinations description     As of June 30,2022, the 2021, 2020, 2019 and 2018 tax years remain open for examination. There were no examinations in progress at period end.    
Percentage of gold held as good delivery gold bars 100.00%   100.00%    
SPDR Gold Mini Shares Trust [Member]          
Significant Accounting Policies [Line Items]          
Fair value of assets and liabilities, amount transferred between levels     $ 0   $ 0
Maximum number of business days within which gold is transferred from the Fund's allocated bullion account with the Custodian     2 days    
Minimum denomination of shares issued redeemed against gold 100,000        
Net realized and change in unrealized gain/(loss) on investment in gold $ (353,429) 160,887 $ 125,138 (283,201)  
Net realized gain/(loss) from investment in gold sold to pay Sponsor fees 112 154 382 500  
Net change in unrealized gain/(loss) on investment in gold (363,675) 160,714 85,557 (320,595)  
Net realized gain/(loss) from gold distributed for the redemption of shares 10,134 $ 19 39,199 $ 36,894  
Reserve for uncertain tax positions $ 0   $ 0    
Income tax examinations description     As of June 30,2022, the 2021, 2020, 2019 and 2018 tax years remain open for examination. There were no examinations in progress at period end.    
Percentage of gold held as good delivery gold bars 100.00%   100.00%