Other Items (Tables)

12 Months Ended

Sep. 30, 2025

Receivables [Abstract]

Details of Accounts Receivable

Table 14.1: Details of Accounts Receivable, Net
	As of September 30,
	2025		2024
	(in thousands)
Billed and billable receivables	$	720,495	$	734,817
Unbilled receivables	187,372		149,488
Allowance for credit losses	(9,772)		(4,791)
Accounts receivable, net	$	898,095	$	879,514

Schedule of Accounts Receivable

Table 14.2: Changes in Allowance for Credit Losses
	For the Year Ended September 30,
	2025		2024		2023
	(in thousands)
Balance at beginning of period	$	4,791	$	3,719	$	8,273
Provision for estimated credit losses	8,980		12,761		7,097
Write-offs, net of recoveries	(3,999)		(11,689)		(11,651)
Balance at end of period	$	9,772	$	4,791	$	3,719

Property, Plant and Equipment

Table 14.3: Details of Property and Equipment, Net
	As of September 30,
	2025		2024
	(in thousands)
Office furniture and equipment	$	108,920	$	123,027
Leasehold improvements	65,944		78,894
Property and equipment, at cost	174,864		201,921
Accumulated depreciation	(143,892)		(162,944)
Property and equipment, net	$	30,972	$	38,977

Schedule of Capitalized Software Development Cost

A summary of activities related to capitalized software costs is shown below:

Table 14.4: Details of Capitalized Software, Net
	As of September 30,
	2025		2024
	(in thousands)
Capitalized software	$	339,141	$	290,426
Accumulated amortization	(124,881)		(102,749)
Capitalized software, net	$	214,260	$	187,677

Schedule of Deferred Contract Cost

A summary of activities related to deferred contract costs is shown below:

Table 14.5: Details of Deferred Contracts Costs, Net
	As of September 30,
	2025		2024
	(in thousands)
Deferred contract costs	$	100,771	$	94,253
Accumulated amortization	(37,439)		(34,821)
Deferred contract costs, net	$	63,332	$	59,432