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Accounts Receivable-Net (Tables) | 12 Months Ended
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Sep. 30, 2015
Accounts Receivable-Net |
Schedule of net accounts receivable |
|  | Fiscal Year Ended |
|  | September 30, 2015 |  | September 30, 2014 |
|  | (in millions) |
Billed |  | $ | 2,426.2 |  | $ | 1,248.4 |
Unbilled |  |  | 2,099.8 |  |  | 1,214.8 |
Contract retentions |  |  | 379.6 |  |  | 263.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accounts receivable—gross |  |  | 4,905.6 |  |  | 2,727.1 |
Allowance for doubtful accounts |  |  | (64.1 | ) |  | (72.1 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accounts receivable—net |  | $ | 4,841.5 |  | $ | 2,655.0 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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