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Goodwill and intangible assets - Schedule of annual amortization of intangible asset (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Annual amortization of intangible assets    
Three months ending September 30, 2025 $ 1,468  
Year ending September 30, 2026 5,776  
Year ending September 30, 2027 5,723  
Year ending September 30, 2028 5,594  
Year ending September 30, 2029 5,587  
Thereafter 39,257  
Intangible assets, net $ 63,405 $ 67,953