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Goodwill and intangible assets - Summary of intangible assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Summary of intangible assets    
Intangible assets, gross $ 95,230 $ 95,230
Less: accumulated amortization (31,825) (27,277)
Intangible assets, net 63,405 67,953
Customer relationships    
Summary of intangible assets    
Intangible assets, gross 79,088 79,088
Trade names    
Summary of intangible assets    
Intangible assets, gross 11,581 11,581
Customer contracts    
Summary of intangible assets    
Intangible assets, gross 3,851 3,851
Non-compete agreements    
Summary of intangible assets    
Intangible assets, gross $ 710 $ 710