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Other Balance Sheet Components (Tables) | 12 Months Ended
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Sep. 30, 2024
Receivables [Abstract] |
Details of Accounts Receivable |
Table 14.1: Details of Accounts Receivable, Net
| As of September 30,
| 2024 |  | 2023
| (in thousands)
Billed and billable receivables | $ | 734,817 |  |  | $ | 692,707 |
Unbilled receivables | 149,488 |  |  | 137,885 |
Allowance for credit losses | (4,791) |  |  | (3,719) |
Accounts receivable, net | $ | 879,514 |  |  | $ | 826,873 |
Schedule of Accounts Receivable |
Table 14.2: Changes in Allowance for Credit Losses
| For the Year Ended September 30,
| 2024 |  | 2023 |  | 2022
| (in thousands)
Balance at beginning of period | $ | 3,719 |  |  | $ | 8,273 |  |  | $ | 8,044 |
Provision for estimated credit losses | 12,761 |  |  | 7,097 |  |  | 6,799 |
Write-offs, net of recoveries | (11,689) |  |  | (11,651) |  |  | (6,570) |
Balance at end of period | $ | 4,791 |  |  | $ | 3,719 |  |  | $ | 8,273 |
Property, Plant and Equipment |
Table 14.3: Details of Property and Equipment, Net
| As of September 30,
| 2024 |  | 2023
| (in thousands)
Office furniture and equipment | $ | 123,027 |  |  | $ | 134,910 |
Leasehold improvements | 78,894 |  |  | 78,520 |
Property and equipment, at cost | 201,921 |  |  | 213,430 |
Accumulated depreciation | (162,944) |  |  | (174,599) |
Property and equipment, net | $ | 38,977 |  |  | $ | 38,831 |
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,
| 2024 |  | 2023
| (in thousands)
Capitalized software | $ | 290,426 |  |  | $ | 195,813 |
Accumulated amortization | (102,749) |  |  | (88,002) |
Capitalized software, net | $ | 187,677 |  |  | $ | 107,811 |
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,
| 2024 |  | 2023
| (in thousands)
Deferred contract costs | $ | 94,253 |  |  | $ | 77,597 |
Accumulated amortization | (34,821) |  |  | (32,225) |
Total deferred contract costs, net | $ | 59,432 |  |  | $ | 45,372 |

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