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Basis of Presentation and summary of significant accounting policies - Property, equipment, and right-of-use assets (Details)
12 Months Ended
Sep. 30, 2025
Rental equipment | Minimum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 1 year
Rental equipment | Maximum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 5 years
Vehicles | Minimum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 1 year
Vehicles | Maximum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 5 years
Leasehold improvements | Minimum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 1 year
Leasehold improvements | Maximum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 11 years
Office and technology equipment  
Property, equipment, and right-of-use assets  
Estimated Useful Life 5 years
Buildings  
Property, equipment, and right-of-use assets  
Estimated Useful Life 25 years
Right-of-use real estate | Minimum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 2 years
Right-of-use real estate | Maximum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 11 years
Right-of-use vehicles | Minimum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 2 years
Right-of-use vehicles | Maximum  
Property, equipment, and right-of-use assets  
Estimated Useful Life 7 years