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Basis of Presentation and summary of significant accounting policies - Intangible assets (Details)
Sep. 30, 2025
Customer relationships | Minimum  
Summary of intangible assets  
Estimated useful lives 10 years
Customer relationships | Maximum  
Summary of intangible assets  
Estimated useful lives 20 years
Customer contracts  
Summary of intangible assets  
Estimated useful lives 2 years
Trade names  
Summary of intangible assets  
Estimated useful lives 10 years
Non-compete agreements  
Summary of intangible assets  
Estimated useful lives 5 years