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Receivables | 12 Months Ended
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Sep. 30, 2018
Receivables [Abstract] |
Receivables | Accounts Receivable, Net Accounts receivable, net at September 30, 2018 and 2017 consisted of the following:
| September 30,
| 2018 |  | 2017
| (In thousands)
Billed | $ | 157,333 |  |  | $ | 126,887 |
Unbilled (1) | 54,971 |  |  | 44,640 |
| 212,304 |  |  | 171,527 |
Less: allowance for doubtful accounts | (3,439 | ) |  | (2,941 | )
Accounts receivable, net | $ | 208,865 |  |  | $ | 168,586 |
(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 in the allowance for doubtful accounts was as follows:
| Year Ended September 30,
| 2018 |  | 2017
| (In thousands)
Balance, beginning of year | $ | 2,941 |  |  | $ | 2,192 |
Add: expense | 623 |  |  | 1,640 |
Less: write-offs (net of recoveries) | (125 | ) |  | (891 | )
Balance, end of year | $ | 3,439 |  |  | $ | 2,941 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -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 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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