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Summary of significant accounting policies - Disclosure of estimated useful lives of intangible assets (Details)
 12 Months Ended
Sep. 30, 2022
Minimum | Internal-use software  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 2 years
Minimum | Business solutions  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 3 years
Minimum | Software licenses  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 3 years
Minimum | Client relationships  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 5 years
Maximum | Internal-use software  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 7 years
Maximum | Business solutions  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 10 years
Maximum | Software licenses  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 8 years
Maximum | Client relationships  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 7 years