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Acquisitions of and investment in businesses - Fair value of the acquired assets and liabilities (Details) - USD ($)
 12 Months Ended
Jul. 01, 2025
Sep. 30, 2025
Sep. 01, 2025
Sep. 30, 2024
Sep. 30, 2023
Acquisitions of and investment in businesses          
Goodwill   $ 61,560,000   $ 50,733,000 $ 52,825,000
Trade names          
Acquisitions of and investment in businesses          
Amortization period   10 years      
Non-compete agreements          
Acquisitions of and investment in businesses          
Amortization period   5 years      
Mediserve Medical Equipment of Kingsport, Inc          
Acquisitions of and investment in businesses          
Accounts receivable   $ 850,000      
Inventory   176,000      
Property, equipment, and right of use assets   1,903,000      
Goodwill   187,000      
Accrued liabilities   (17,000)      
Deferred revenue   (170,000)      
Lease liabilities   (313,000)      
Net assets acquired   2,616,000      
Cash paid at closing $ 2,466,000 2,466,000      
Holdback payable 150,000 150,000      
Consideration paid or payable $ 2,616,000 2,616,000      
Hart          
Acquisitions of and investment in businesses          
Accounts receivable   7,307,000      
Inventory   2,194,000      
Prepaid and other current assets   426,000      
Property, equipment, and right of use assets   10,376,000      
Goodwill   10,640,000      
Accounts payable   (10,467,000)      
Accrued liabilities   (2,104,000)      
Deferred revenue   (876,000)      
Lease liabilities   (2,217,000)      
Net assets acquired   30,939,000 $ 30,939,000    
Minority interest   (11,581,000)      
Consideration for controlling interest   19,358,000      
Cash paid at closing   20,633,000      
Cash acquired   (1,275,000)      
Consideration paid or payable   19,358,000      
Hart | Trade names          
Acquisitions of and investment in businesses          
Intangible asset   $ 3,500,000      
Amortization period   10 years      
Hart | Customer relationships          
Acquisitions of and investment in businesses          
Intangible asset   $ 11,960,000      
Amortization period   20 years      
Hart | Non-compete agreements          
Acquisitions of and investment in businesses          
Intangible asset   $ 200,000      
Amortization period   5 years