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Receivables (Tables) | 12 Months Ended
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Sep. 30, 2016
Receivables [Abstract] |
Receivables | Receivables at September 30, 2016 and 2015 consisted of the following:
| September 30,
| 2016 |  | 2015
| (In thousands)
Billed | $ | 124,731 |  |  | $ | 114,464 |
Unbilled (1) | 45,247 |  |  | 46,435 |
| 169,978 |  |  | 160,899 |
Less: allowance for doubtful accounts | (2,192 | ) |  | (2,126 | )
Receivables, net | $ | 167,786 |  |  | $ | 158,773 |
(1) | Represents revenue recorded in excess of amounts billable pursuant to contract provisions and generally become billable at contractually specified dates or upon the attainment of milestones. Unbilled amounts are expected to be realized within one year.
Activity of Allowance for Doubtful Accounts | Activity in the allowance for doubtful accounts was as follows:
| Year Ended September 30,
| 2016 |  | 2015
| (In thousands)
Balance, beginning of year | $ | 2,126 |  |  | $ | 2,927 |
Add: expense | 2,011 |  |  | — |
Less: write-offs (net of recoveries) | (1,945 | ) |  | (801 | )
Balance, end of year | $ | 2,192 |  |  | $ | 2,126 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + 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://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 + Details
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