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Revenue Recognition - Accounts receivable, net (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Sep. 30, 2022
Billed | $ 2,096,400 | $ 1,931,400
Contract retentions | 499,200 | 490,400
Total accounts receivable-gross | 2,595,600 | 2,421,800
Allowance for doubtful accounts and credit losses | (77,100) | (104,000)
Total accounts receivable-net | 2,518,519 | 2,317,812
Additional disclosures |  |
Significant claims recorded in contract assets and other non-current assets | 150,000 | 110,000
Trade receivables sold with no financial and legal obligations | $ 272,600 | $ 240,300
Outstanding receivables |  |
Additional disclosures |  |
Number of customers accounting for 10% | No | No
Concentration 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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