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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTING STANDARDS UPDATE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Oct. 01, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | $ 317,155 |  | $ 541,304 |  |
Sales tax |  |  | $ 19,900 | 34,400 |  |
Accumulated other comprehensive income (loss) |  | $ (15,517) |  | (15,517) |  | $ (12,610)
Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings | [1] |  |  |  | $ 2,736 |
Accounting Standards Update 2017-05 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings | [1] |  |  |  | (4,970) |
Deferred gain, unamortized balance |  |  |  |  | (6,800) |
Home Services and Other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings |  |  |  |  | (3,800) |
Revenues from contracts with customers |  |  | 12,300 | 24,800 |  |
Revenues |  |  | $ 8,700 | $ 18,800 |  |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings | [1] |  |  |  | 2,736 |
Retained Earnings | Accounting Standards Update 2017-05 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings | [1] |  |  |  | (4,970) |
Retained Earnings | Home Services and Other | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings |  |  |  |  | (2,700) |
Investments in Equity Securities |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification to retained earnings | [2] |  |  |  | 3,446 |
Accumulated other comprehensive income (loss) |  |  |  |  | $ 4,700 |
[1] | See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.
[2] | Due to the adoption of ASU No. 2016-01, an amendment to ASC 825, Financial Instruments. See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.

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