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Organization (Details)
$ in Millions
3 Months Ended
Jun. 23, 2021
USD ($)
Sep. 30, 2021
Segment
Jun. 29, 2021
May 31, 2021
Sep. 07, 2018
Mar. 31, 2018
USD ($)
ft²
a
Building
Number of business operating segments | Segment   2        
Area of land | a           17
Discontinued Operations            
Investment in real estate business           $ 2.7
Number of buildings | Building           2
Area of land | ft²           257,000
Sale of real estate business for cash $ 4.6          
Great Elm DME Holdings Incorporation            
Percentage of equity interest acquired (as a percent)         80.10%  
GP Corp.            
Ownership percentage     98.20%      
Great Elm DME Holdings Incorporation            
Ownership percentage       80.10%