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Revenue Recognition (Tables) | 6 Months Ended
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Mar. 31, 2024
Revenue Recognition. |
Schedule of revenues disaggregated by revenue sources | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | March 31, | ​ | March 31, | ​ | March 31, | ​ | March 31,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
​ |  | (in millions)
Cost reimbursable | ​ | $ | 1,605.1 | ​ | $ | 1,511.3 | ​ | $ | 3,222.3 | ​ | $ | 3,026.2
Guaranteed maximum price | ​ | ​ | 1,420.7 | ​ | ​ | 1,151.0 | ​ | ​ | 2,835.6 | ​ | ​ | 2,239.2
Fixed-price | ​ | ​ | 918.1 | ​ | ​ | 827.8 | ​ | ​ | 1,785.9 | ​ | ​ | 1,607.1
Total revenue | ​ | $ | 3,943.9 | ​ | $ | 3,490.1 | ​ | $ | 7,843.8 | ​ | $ | 6,872.5
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | March 31, | ​ | March 31, | ​ | March 31, | ​ | March 31,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
​ |  | (in millions)
Americas | ​ | $ | 3,039.1 | ​ | $ | 2,630.3 | ​ | $ | 6,077.9 | ​ | $ | 5,209.9
Europe, Middle East, India, Africa | ​ | ​ | 619.8 | ​ | ​ | 494.1 | ​ | ​ | 1,115.2 | ​ | ​ | 942.1
Asia-Australia-Pacific | ​ | ​ | 285.0 | ​ | ​ | 365.7 | ​ | ​ | 650.7 | ​ | ​ | 720.5
Total revenue | ​ | $ | 3,943.9 | ​ | $ | 3,490.1 | ​ | $ | 7,843.8 | ​ | $ | 6,872.5
​
Schedule of net accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | September 30,
​ | ​ | 2024 |  | 2023
​ | ​ | (in millions)
Billed | ​ | $ | 2,125.4 | ​ | $ | 2,122.2
Contract retentions | ​ |  | 602.8 | ​ | ​ | 516.5
Total accounts receivable—gross | ​ |  | 2,728.2 | ​ | ​ | 2,638.7
Allowance for doubtful accounts and credit losses | ​ |  | (81.5) | ​ | ​ | (94.2)
Total accounts receivable—net | ​ | $ | 2,646.7 | ​ | $ | 2,544.5

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + 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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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