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Holding Company Reorganization and Financing Transaction - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Dec. 29, 2020
Dec. 31, 2020
Reorganizations [Line Items]    
Reorganization date   Dec. 21, 2020
Plan of reorganization, description of equity securities issued or to be issued   On December 29, 2020, pursuant to the terms of the Agreement and Plan of Merger, dated as of December 21, 2020, among Forest, the Company and Forest Merger Sub, Inc., a newly created entity for the purpose of facilitating the Merger, (as it may be amended from time to time, the Merger Agreement), the transactions contemplated by the Merger Agreement (the Transactions) were consummated. As a result of the Transactions, and subject to the same terms and conditions as applied immediately prior to the Transactions, each share of Forest's outstanding common stock, common stock options, restricted stock units and restricted shares were exchanged for identical instruments of the Company
Great Elm Healthcare, LLC (HC LLC)    
Reorganizations [Line Items]    
Reimbursement amount received to cover deal costs $ 1.3  
Forest Merger Sub Inc | J.P. Morgan Broker-Dealer Holdings Inc. (JPM)    
Reorganizations [Line Items]    
JPM financing arrangement aggregate amount $ 37.7  
Forest Investments, Inc. (Forest) | J.P. Morgan Broker-Dealer Holdings Inc. (JPM)    
Reorganizations [Line Items]    
JPM acquired percentage 20.00%  
Business acquisition, common stock purchase price $ 2.7  
Forest Investments, Inc. (Forest) | Forest Preferred Stock Classified as Liability    
Reorganizations [Line Items]    
Redeemable preferred stock, shares 35,010  
Redeemable preferred stock, annual dividend rate 9.00%  
Redeemable Preferred stock, redemption date Dec. 29, 2027  
Redeemable Preferred stock, redemption price per share $ 1,000.00  
Redeemable preferred stock, face value per share $ 1,000  
Forest Investments, Inc. (Forest) | Series A-1 Preferred Stock Classified as Liability    
Reorganizations [Line Items]    
Redeemable preferred stock, shares 8,082  
Great Elm Healthcare, LLC (HC LLC) | Series A-2 Preferred Stock Classified as Liability    
Reorganizations [Line Items]    
Redeemable preferred stock, shares 34,010  
Redeemable preferred stock, annual dividend rate 9.00%  
Redeemable Preferred stock, redemption date Dec. 29, 2027  
Redeemable Preferred stock, redemption price per share $ 1,000.00  
Percentage of proceeds arising from sale of durable medical equipment business 33.00%  
Great Elm Healthcare, LLC (HC LLC) | Series A-1 Preferred Stock Classified as Liability    
Reorganizations [Line Items]    
Redeemable preferred stock, shares 10,090  
Redeemable preferred stock, annual dividend rate 9.00%  
Redeemable Preferred stock, redemption date Dec. 29, 2027  
Redeemable Preferred stock, redemption price per share $ 1,000  
Redeemable preferred stock, face value per share $ 1,000.00  
Great Elm Healthcare, LLC (HC LLC) | Series A-1 Preferred Stock Classified as Liability | Forest Investments, Inc. (Forest)    
Reorganizations [Line Items]    
Preferred stock holding percentage 80.10%  
Great Elm Healthcare, LLC (HC LLC) | Series A-1 Preferred Stock Classified as Liability | Corbel Capital Partners SBIC, L.P. (Corbel)    
Reorganizations [Line Items]    
Preferred stock holding percentage 9.95%  
Great Elm Healthcare, LLC (HC LLC) | Series A-1 Preferred Stock Classified as Liability | Valley Healthcare Holdings, LLC (VHH)    
Reorganizations [Line Items]    
Preferred stock holding percentage 9.95%  
DME, Inc. | Great Elm Healthcare, LLC (HC LLC)    
Reorganizations [Line Items]    
Cash $ 1.9