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Accounts Receivable - Net | 3 Months Ended
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Dec. 31, 2017
Accounts Receivable - Net |
Accounts Receivable - Net | 4.Accounts Receivable—Net Net accounts receivable consisted of the following:
|  | December 31, 2017 |  | September 30, 2017 |
|  | (in millions) |
Billed |  | $ | 2,511.6 |  | $ | 2,317.8 |
Unbilled |  | 2,254.5 |  | 2,293.5 |
Contract retentions |  | 598.9 |  | 568.6 |
Total accounts receivable—gross |  | 5,365.0 |  | 5,179.9 |
Allowance for doubtful accounts |  | (51.3 | ) | (52.2 | )
Total accounts receivable—net |  | $ | 5,313.7 |  | $ | 5,127.7 |
Billed accounts receivable represents amounts billed to clients that have yet to be collected. Unbilled accounts receivable represents the contract revenue recognized but not yet billed pursuant to contract terms or accounts billed after the period end. Substantially all unbilled receivables as of December 31, 2017 and September 30, 2017 are expected to be billed and collected within twelve months. Contract retentions represent amounts invoiced to clients where payments have been withheld pending the completion of certain milestones, other contractual conditions, or upon the completion of a project. These retention agreements vary from project to project and could be outstanding for several months or years. Allowances for doubtful accounts have been determined through specific identification of amounts considered to be uncollectible and potential write-offs, plus a non-specific allowance for other amounts for which some potential loss has been determined to be probable based on current and past experience. Other than the U.S. government, no single client accounted for more than 10% of the Company’s outstanding receivables at December 31, 2017 and September 30, 2017. The Company sold trade receivables to financial institutions, of which $314.7 million and $325.2 million were outstanding as of December 31, 2017 and September 30, 2017, respectively. The Company does not retain financial or legal obligations for these receivables that would result in material losses. The Company’s ongoing involvement is limited to the remittance of customer payments to the financial institutions with respect to the sold trade receivables.

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