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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTING STANDARDS UPDATE (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues from contracts with customers |  | $ 224,149 |  |
Accumulated other comprehensive income (loss) |  | (15,822) |  | $ (12,610)
Sales tax |  | 14,400 |  |
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 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification to retained earnings | [1] |  | 0 |
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 |  | 12,500 |  |
Home Services and Other | Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues from contracts with customers |  | 2,400 |  |
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 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification to retained earnings | [1] |  | 3,446 |
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 |
As Previously Reported | Home Services and Other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues from contracts with customers |  | $ 10,100 |  |
[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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