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Accounts Receivable-Net (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Accounts Receivable-Net |  |
Billed | $ 1,248,400,000 | $ 1,177,600,000
Unbilled | 1,214,800,000 | 1,076,800,000
Contract retentions | 263,900,000 | 174,300,000
Total accounts receivable-gross | 2,727,100,000 | 2,428,700,000
Allowance for doubtful accounts | (72,100,000) | (86,400,000)
Total accounts receivable -net | 2,654,976,000 | 2,342,262,000
Period in which unbilled receivables are expected to be billed and collected | 12 months | 12 months
Sale of trade receivables, outstanding | $ 111,900,000 | $ 100,200,000

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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