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Revenue Recognition - Accounts receivable, net (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Billed | $ 2,101,500 | $ 2,122,200
Contract retentions | 644,800 | 516,500
Total accounts receivable-gross | 2,746,300 | 2,638,700
Allowance for doubtful accounts and credit losses | (85,900) | (94,200)
Total accounts receivable-net | $ 2,660,421 | $ 2,544,453
Additional disclosures |  |
Unbilled receivables are expected to be billed and collected (in months) | 12 months | 12 months
Significant claims recorded in contract assets and other non-current assets | $ 170,000 | $ 160,000
Trade receivables sold with no financial and legal obligations | $ 305,700 | $ 291,000
Outstanding receivables |  |
Additional disclosures |  |
Number of customers accounting for 10% | No | No
Concentration of risk threshold percentage | 10.00% | 10.00%

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- Definition The amounts in excess of the agreed contract price (or amounts not included in the original contract price) that the company seeks to collect from customers or others for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs recorded in contract assets and other non current assets. + References No definition available. + Details
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- Definition Represents the period in which unbilled receivables are expected to be billed and collected in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 + Details
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