Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Life of Property and Equipment (Details)	Sep. 30, 2024
Data processing equipment and purchased software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Data processing equipment and purchased software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	6 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	Useful Life, Shorter of Lease Term or Asset Utility [Member]
Software Development
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	4 years