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Contract Balances and Performance Obligations - Revenue from Contract with Customer (Tables) | 9 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | Receivables at June 30, 2021 and September 30, 2020 consisted of the following:
| June 30, 2021 |  | September 30, 2020
| (In thousands)
Billed | $ | 157,777 |  |  | $ | 211,776 |
Unbilled | 168,818 |  |  | 181,550 |
| 326,595 |  |  | 393,326 |
Less: allowance for doubtful accounts | (4,505) |  |  | (5,072) |
Net receivables | 322,090 |  |  | 388,254 |
Less: long-term receivables * | (41,492) |  |  | (54,074) |
Short-term receivables * | $ | 280,598 |  |  | 334,180 |
* Short-term receivables and long-term receivables were recorded in accounts receivable, net and other assets, respectively, within the accompanying condensed consolidated balance sheets. Significant changes in the deferred revenues balances during the nine months ended June 30, 2021 were as follows:
| Nine Months Ended June 30, 2021
| (In thousands)
Deferred revenues at September 30, 2020 * | $ | 122,141 |
Revenue recognized that was included in the deferred revenues balance at the beginning of the period | (78,551) |
Increases due to billings, excluding amounts recognized as revenue during the period | 78,658 |
Decrease due to divestiture of the C&R business | (16,671) |
Deferred revenues at June 30, 2021 * | $ | 105,577 |
* Deferred revenues at September 30, 2020 included current portion of $115.2 million and long-term portion of $6.9 million that were recorded in deferred revenue and other liabilities, respectively, within the condensed consolidated balance sheets. Deferred revenues at June 30, 2021 included current portion of $99.8 million and long-term portion of $5.8 million that were recorded in deferred revenue and other liabilities, respectively, within the condensed consolidated balance sheets.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=121604090&loc=SL49130551-203045 + Details
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