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Goodwill and intangible assets - Goodwill continuity (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Activity in goodwill    
Goodwill, Beginning balance $ 50,733 $ 52,825
Goodwill, Ending balance 61,560 50,733
Southern    
Activity in goodwill    
Adjustments   $ (2,092)
Mediserve    
Activity in goodwill    
Acquisitions 187  
Goodwill, Ending balance 187  
Hart    
Activity in goodwill    
Acquisitions 10,640  
Goodwill, Ending balance $ 10,640