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Contract Balances and Performance Obligation Revenue from Contract with Customer (Tables) | 6 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | Significant changes in the deferred revenues balances during the six months ended March 31, 2020 and 2019 were as follows:
| Six Months Ended March 31, 2020
| (In thousands)
Deferred revenues at September 30, 2019 | $ | 116,320 |
Revenue recognized that was included in the deferred revenues balance at the beginning of the period | (75,148 | )
Increases due to billings, excluding amounts recognized as revenue during the period | 80,382 |
Deferred revenues at March 31, 2020 | $ | 121,554 |
(*) Deferred revenues at September 30, 2019 included current portion of $111.0 million and long-term portion of $5.3 million that were recorded in deferred revenue and other liabilities, respectively, within the condensed consolidated balance sheets. Deferred revenues at March 31, 2020 included current portion of $114.4 million and long-term portion of $7.2 million that were recorded in deferred revenue and other liabilities, respectively, within the condensed consolidated balance sheets. Receivables at March 31, 2020 and September 30, 2019 consisted of the following:
| March 31, 2020 |  | September 30, 2019
| (In thousands)
Billed | $ | 199,102 |  |  | $ | 206,714 |
Unbilled | 146,226 |  |  | 127,651 |
| 345,328 |  |  | 334,365 |
Less: allowance for doubtful accounts | (5,248 | ) |  | (2,568 | )
Net receivables | 340,080 |  |  | 331,797 |
Less: long-term receivables * | (32,773 | ) |  | (34,370 | )
Short-term receivables * | $ | 307,307 |  |  | $ | 297,427 |
(*) Short-term receivables and long-term receivables were recorded in accounts receivable, net and other assets, respectively, within the accompanying condensed consolidated balance sheets.

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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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