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Contract Balances and Performance Obligations Contract Balances and Performance Obligations (Tables) | 12 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Receivables | Receivables at September 30, 2019 and 2018 consisted of the following:
| September 30,
| 2019 |  | 2018
|  |  | As Adjusted
| (In thousands)
Billed | $ | 206,714 |  |  | $ | 196,960 |
Unbilled | 127,651 |  |  | 73,221 |
| 334,365 |  |  | 270,181 |
Less: allowance for doubtful accounts | (2,568 | ) |  | (3,439 | )
Net receivables (*) | $ | 331,797 |  |  | $ | 266,742 |
(*) Included short-term receivables of $297.4 million and long-term receivables of $34.4 million that were recorded in accounts receivable, net and other assets, respectively, within the accompanying consolidated balance sheets at September 30, 2019. Long-term receivables were not material at September 30, 2018.
Accounts Receivable, Allowance for Credit Loss | Activity in the allowance for doubtful accounts was as follows:
| Year Ended September 30,
| 2019 |  | 2018
| (In thousands)
Balance, beginning of year | $ | 3,439 |  |  | $ | 2,941 |
Add: expense | 518 |  |  | 623 |
Less: write-offs (net of recoveries) | (1,389 | ) |  | (125 | )
Balance, end of year | $ | 2,568 |  |  | $ | 3,439 |
Contract with Customer, Asset and Liability | Significant changes in the deferred revenues balances are as follows:
| Year Ended September 30,
| 2019 |  | 2018
|  |  | As Adjusted
| (In thousands)
Deferred revenues, beginning balance | $ | 108,118 |  |  | $ | 114,729 |
Revenue recognized that was included in the deferred revenues balance at the beginning of the period | (93,265 | ) |  | (83,125 | )
Increases due to billings, excluding amounts recognized as revenue during the period | 101,467 |  |  | 76,514 |
Deferred revenues, ending balance (*) | $ | 116,320 |  |  | $ | 108,118 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period:
Year Ending September 30, | Performance Obligations
| (In thousands)
2020 | $ | 84,022 |
2021 | 66,809 |
2022 | 39,960 |
2023 | 26,188 |
2024 | 16,512 |
Thereafter | 4,879 |
Total | $ | 238,370 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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