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Accounts Receivable, Net (Tables) | 12 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Details of Accounts Receivable |
Table 16.1: Details of Accounts Receivable, Net
| As of September 30,
| 2021 |  | 2020
| (in thousands)
Billed and billable receivables | $ | 718,728 |  |  | $ | 628,922 |
Unbilled receivables | 124,135 |  |  | 163,332 |
Allowance for credit losses | (8,044) |  |  | (6,051) |
Accounts receivable, net | $ | 834,819 |  |  | $ | 786,203 |
Schedule of Accounts Receivable |
Table 16.2: Changes in Allowance for Credit Losses
| For the Year Ended September 30,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Balance at beginning of period | $ | 6,051 |  |  | $ | 5,382 |  |  | $ | 4,285 |
Provision for estimated credit losses | 11,038 |  |  | 12,976 |  |  | 4,018 |
Write-offs, net of recoveries | (9,045) |  |  | (12,307) |  |  | (2,921) |
Balance at end of period | $ | 8,044 |  |  | $ | 6,051 |  |  | $ | 5,382 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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