v3.26.3
CONSOLIDATED SCHEDULE OF INVESTMENTS (Parenthetical) 3
$ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 01, 2026
Sep. 30, 2026
USD ($)
director
Dec. 31, 2016
Jun. 30, 2026
USD ($)
director
Sep. 30, 2026
CAD ($)
director
Jun. 30, 2026
CAD ($)
director
Dec. 10, 2018
director
Schedule of Investments [Line Items]              
Investments at fair value   $ 5,944,478 [1]   $ 6,342,558 [2]      
Residual Profit, New TLA and TLD       8.33%   8.33%  
Investment, basis spread, variable rate, TLA and TLD   3.75%   4.00% 3.75% 4.00%  
Universal Turbine Parts, LLC              
Schedule of Investments [Line Items]              
Number of board of directors appointed | director   3   3 3 3 3
First Tower Finance Company LLC              
Schedule of Investments [Line Items]              
Ownership interest   78.06%          
First Tower Finance Company LLC | First Tower Holdings of Delaware LLC              
Schedule of Investments [Line Items]              
Ownership interest   80.10%   80.10%      
Fully diluted ownership interest   78.06%   78.06%      
First Tower, LLC | First Tower Finance Company LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
MITY, Inc. | MITY Holdings of Delaware Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Broda Enterprises ULC              
Schedule of Investments [Line Items]              
Investments at fair value         $ 7,371 $ 7,371  
Broda Enterprises ULC | MITY, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
MITY-Lite, Inc. | MITY, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Broda USA, Inc. | MITY, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
NPH Property Holdings, LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%          
National Property REIT Corp. | NPH Property Holdings, LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Nationwide Loan Company LLC | Nationwide Loan Company LLC              
Schedule of Investments [Line Items]              
Ownership interest   94.22%   94.22%      
NMMB, Inc. | NMMB Holdings, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   92.77%   92.77%      
NMMB, Inc. | Refuel Agency, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Armed Forces Communications, Inc. | NMMB, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Valley Electric Company, Inc. | Valley Electric Holdings II, Inc.              
Schedule of Investments [Line Items]              
Ownership interest       94.99%      
Valley Electric Holdings II, Inc. | Valley Electric Holdings I, Inc.              
Schedule of Investments [Line Items]              
Ownership interest       100.00%      
VE Company, Inc. | Valley Electric Company, Inc.              
Schedule of Investments [Line Items]              
Ownership interest       100.00%      
Valley Electric Co. of Mt. Vernon, Inc. | VE Company, Inc.              
Schedule of Investments [Line Items]              
Ownership interest       100.00%      
Subsidiaries | Reportable Legal Entities | First Tower Holdings of Delaware LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | Energy Solutions Holdings Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | MITY Holdings of Delaware Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | MITY FSC, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00% 100.00% 100.00%      
Subsidiaries | Reportable Legal Entities | NPH Property Holdings, LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | Nationwide Loan Company LLC              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | NMMB Holdings, Inc.              
Schedule of Investments [Line Items]              
Ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | Strategic Chemical Solutions Corp              
Schedule of Investments [Line Items]              
Ownership interest   99.96%          
Subsidiaries | Reportable Legal Entities | Valley Electric Company, Inc.              
Schedule of Investments [Line Items]              
Ownership interest disposed percent 94.99% 94.99%          
Subsidiaries | Reportable Legal Entities | Encinitas Watches Holdco, LLC              
Schedule of Investments [Line Items]              
Ownership interest   8.57%   8.57%      
Subsidiaries | Reportable Legal Entities | Pacific World Corporation              
Schedule of Investments [Line Items]              
Ownership interest   99.99%   99.99%      
Preferred equity ownership interest   100.00%   100.00%      
Subsidiaries | Reportable Legal Entities | USES Corp.              
Schedule of Investments [Line Items]              
Ownership interest       99.96%      
Subsidiaries | Reportable Legal Entities | Valley Electric Holdings I, Inc.              
Schedule of Investments [Line Items]              
Ownership interest       100.00%      
[1] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.
[2] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.