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REVENUE Timing of Revenue Recognition (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 USD ($)
Timing of Revenue Recognition [Roll Forward] |
Billed, beginning | $ 205,490
Unbilled, beginning | 7,199
Customers' credit, beginning | 27,325
Increase (decrease) for accounts receivable, billed | 112,618
Increase (decrease) for unbilled revenue | 47,956
Increase (decrease) for customers' credits | 2,304
Billed, end | 318,108
Unbilled, end | 55,155
Customers' credit, end | $ 29,629

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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