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Other Balance Sheet Components (Tables) | 12 Months Ended
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Sep. 30, 2023
Receivables [Abstract] |
Details of Accounts Receivable |
Table 14.1: Details of Accounts Receivable, Net
| As of September 30,
| 2023 |  | 2022
| (in thousands)
Billed and billable receivables | $ | 692,707 |  |  | $ | 723,979 |
Unbilled receivables | 137,885 |  |  | 91,404 |
Allowance for credit losses | (3,719) |  |  | (8,273) |
Accounts receivable, net | $ | 826,873 |  |  | $ | 807,110 |
Schedule of Accounts Receivable |
Table 14.2: Changes in Allowance for Credit Losses
| For the Year Ended September 30,
| 2023 |  | 2022 |  | 2021
| (in thousands)
Balance at beginning of period | $ | 8,273 |  |  | $ | 8,044 |  |  | $ | 6,051 |
Provision for estimated credit losses | 7,097 |  |  | 6,799 |  |  | 11,038 |
Write-offs, net of recoveries | (11,651) |  |  | (6,570) |  |  | (9,045) |
Balance at end of period | $ | 3,719 |  |  | $ | 8,273 |  |  | $ | 8,044 |
Property, Plant and Equipment |
Table 14.3: Details of Property and Equipment, Net
| As of September 30,
| 2023 |  | 2022
| (in thousands)
Office furniture and equipment | $ | 134,910 |  |  | $ | 209,258 |
Leasehold improvements | 78,520 |  |  | 78,727 |
Property and equipment, at cost | 213,430 |  |  | 287,985 |
Accumulated depreciation | (174,599) |  |  | (235,727) |
Property and equipment, net | $ | 38,831 |  |  | $ | 52,258 |
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,
| 2023 |  | 2022
| (in thousands)
Capitalized software | $ | 195,813 |  |  | $ | 161,353 |
Accumulated amortization | (88,002) |  |  | (102,613) |
Capitalized software, net | $ | 107,811 |  |  | $ | 58,740 |
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,
| 2023 |  | 2022
| (in thousands)
Deferred contract costs | $ | 77,597 |  |  | $ | 76,498 |
Accumulated amortization | (32,225) |  |  | (28,766) |
Total deferred contract costs, net | $ | 45,372 |  |  | $ | 47,732 |
Schedule of Changes in Accumulated Other Comprehensive Loss | The following table shows changes in accumulated other comprehensive loss.
Table 14.6: Details of Changes in Accumulated Other Comprehensive Loss by Category
| Foreign currency translation adjustment |  | Net unrealized (loss)/gain on derivatives, net of tax |  | Total
| (in thousands)
Balance as of September 30, 2020 | $ | (42,638) |  |  | $ | — |  |  | $ | (42,638) |
Other comprehensive income/(loss) before reclassifications | 3,033 |  |  | (811) |  |  | 2,222 |
Amounts reclassified from accumulated other comprehensive income/(loss) | — |  |  | 508 |  |  | 508 |
Net current period other comprehensive income/(loss) | 3,033 |  |  | (303) |  |  | 2,730 |
Balance as of September 30, 2021 | (39,605) |  |  | (303) |  |  | (39,908) |
Other comprehensive income/(loss) before reclassifications | (17,504) |  |  | 23,004 |  |  | 5,500 |
Amounts reclassified from accumulated other comprehensive income/(loss) | — |  |  | 447 |  |  | 447 |
Net current period other comprehensive income/(loss) | (17,504) |  |  | 23,451 |  |  | 5,947 |
Balance as of September 30, 2022 | (57,109) |  |  | 23,148 |  |  | (33,961) |
Other comprehensive income/(loss) before reclassifications | 6,509 |  |  | 8,558 |  |  | 15,067 |
Amounts reclassified from accumulated other comprehensive income/(loss) | 116 |  |  | (8,837) |  |  | (8,721) |
Net current period other comprehensive income/(loss) | 6,625 |  |  | (279) |  |  | 6,346 |
Balance as of September 30, 2023 | $ | (50,484) |  |  | $ | 22,869 |  |  | $ | (27,615) |

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