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Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2020
Revenue Recognition |
Schedule of revenues disaggregated by revenue sources | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (in millions)
Cost reimbursable | ​ | $ | 5,734.5 | ​ | $ | 5,958.2 | ​ | $ | 5,440.3
Guaranteed maximum price | ​ | ​ | 3,896.8 |  | ​ | 3,962.6 |  | ​ | 4,673.9
Fixed price | ​ | ​ | 3,608.7 |  | ​ | 3.721.7 |  | ​ | 3,764.1
Total revenue | ​ | $ | 13,240.0 | ​ | $ | 13,642.5 | ​ | $ | 13,878.3
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (in millions)
Americas | ​ | $ | 10,138.3 | ​ | $ | 10,390.8 | ​ | $ | 10,512.3
Europe, Middle East, Africa | ​ | ​ | 1,620.3 |  | ​ | 1,752.1 |  | ​ | 1,816.2
Asia Pacific |  | ​ | 1,481.4 |  | ​ | 1,499.6 |  | ​ | 1,549.8
Total revenue | ​ | $ | 13,240.0 | ​ | $ | 13,642.5 | ​ | $ | 13,878.3
​
Schedule of net accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ |  | September 30, |  | September 30,
​ | ​ | 2020 | ​ | 2019
​ | ​ | (in millions)
Billed | ​ | $ | 2,419.6 | ​ | $ | 2,368.2
Contract retentions | ​ |  | 524.2 | ​ |  | 557.5
Total accounts receivable—gross | ​ |  | 2,943.8 | ​ |  | 2,925.7
Allowance for doubtful accounts | ​ |  | (77.9) | ​ |  | (56.5)
Total accounts receivable—net | ​ | $ | 2,865.9 | ​ | $ | 2,869.2
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + 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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