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Other Balance Sheet Components (Tables) | 12 Months Ended
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Sep. 30, 2022
Receivables [Abstract] |
Details of Accounts Receivable |
Table 14.1: Details of Accounts Receivable, Net
| As of September 30,
| 2022 |  | 2021
| (in thousands)
Billed and billable receivables | $ | 723,979 |  |  | $ | 718,728 |
Unbilled receivables | 91,404 |  |  | 124,135 |
Allowance for credit losses | (8,273) |  |  | (8,044) |
Accounts receivable, net | $ | 807,110 |  |  | $ | 834,819 |
Schedule of Accounts Receivable |
Table 14.2: Changes in Allowance for Credit Losses
| For the Year Ended September 30,
| 2022 |  | 2021 |  | 2020
| (in thousands)
Balance at beginning of period | $ | 8,044 |  |  | $ | 6,051 |  |  | $ | 5,382 |
Provision for estimated credit losses | 6,799 |  |  | 11,038 |  |  | 12,976 |
Write-offs, net of recoveries | (6,570) |  |  | (9,045) |  |  | (12,307) |
Balance at end of period | $ | 8,273 |  |  | $ | 8,044 |  |  | $ | 6,051 |
Property, Plant and Equipment |
Table 14.3: Details of Property and Equipment, Net
| As of September 30,
| 2022 |  | 2021
| (in thousands)
Land | $ | — |  |  | $ | 1,738 |
Building and improvements | — |  |  | 11,981 |
Office furniture and equipment | 209,258 |  |  | 254,102 |
Leasehold improvements | 78,727 |  |  | 79,938 |
Property and equipment, at cost | 287,985 |  |  | 347,759 |
Accumulated depreciation | (235,727) |  |  | (285,132) |
Property and equipment, net | $ | 52,258 |  |  | $ | 62,627 |
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,
| 2022 |  | 2021
| (in thousands)
Capitalized software | $ | 161,353 |  |  | $ | 139,145 |
Accumulated amortization | (102,613) |  |  | (96,277) |
Capitalized software, net | $ | 58,740 |  |  | $ | 42,868 |
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,
| 2022 |  | 2021
| (in thousands)
Deferred contract costs | $ | 76,498 |  |  | $ | 67,209 |
Accumulated amortization | (28,766) |  |  | (30,723) |
Total deferred contract costs, net | $ | 47,732 |  |  | $ | 36,486 |

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