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Goodwill and intangible assets - Intangible Assets Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Mar. 31, 2025
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 66,130 $ 19,120
Impairment (35,864)  
Accumulated amortization (15,788) (5,169)
Intangible assets, net $ 14,478 $ 13,951
Developed Technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted average Amortization period in years 17 years 17 years
Gross carrying amount $ 50,020 $ 19,120
Impairment (25,198)  
Accumulated amortization (10,344) (5,169)
Intangible assets, net 14,478 $ 13,951
Customer Relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 15,210  
Impairment (10,541)  
Accumulated amortization (4,669)  
Intangible assets, net 0  
Tradenames & Trademarks    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 900  
Impairment (125)  
Accumulated amortization (775)  
Intangible assets, net $ 0