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Related Parties Additional Information (Detail)
3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Right
shares
Jun. 30, 2021
USD ($)
Right
Jun. 30, 2022
USD ($)
Right
shares
Jun. 30, 2021
USD ($)
Right
Mar. 02, 2022
USD ($)
Sep. 30, 2021
USD ($)
Right
shares
Related Party Transaction [Line Items]            
Shares of the Trust, held by related parties | shares 3,643,924   3,643,924     3,753,580
Related party sponsor fee percentage     2.50%      
Number of incidental rights held | Right 0   0     0
Number of Incidental Rights distributed | Right 0 0 0 0    
Sponsor's Fees incurred $ 102,306 $ 361,512 $ 599,946 $ 541,417    
Accrued and unpaid Sponsor's Fees 0   0     $ 0
Additional trust expenses paid by sponsor $ 0     $ 0    
Maximum [Member]            
Related Party Transaction [Line Items]            
Common Stock Value, Shares Authorized         $ 10,000,000  
Sponsor            
Related Party Transaction [Line Items]            
Related party maximum transaction in a fiscal year     $ 600,000      
Sponsor | Coinbase Inc            
Related Party Transaction [Line Items]            
Percentage of minority interest owned 1.00%   1.00%      
Non Sponsor            
Related Party Transaction [Line Items]            
Related party maximum transaction in a fiscal year     $ 600,000      
DCG [Member] | Maximum [Member]            
Related Party Transaction [Line Items]            
Amount of the Trust, held by related parties $ 10,000.00   $ 10,000.00