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Accounts Receivable-Net (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015
Accounts Receivable-Net |  |
Billed | $ 2,376,500 | $ 2,426,200
Unbilled | 2,062,100 | 2,099,800
Contract retentions | 427,800 | 379,600
Total accounts receivable-gross | 4,866,400 | 4,905,600
Allowance for doubtful accounts | (65,200) | (64,100)
Total accounts receivable-net | $ 4,801,196 | $ 4,841,450
Period in which unbilled receivables are expected to be billed and collected | 12 months | 12 months
Total receivables sold that remain outstanding | $ 252,100 | $ 240,800

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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + 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 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 + Details
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