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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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