SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - RECENTLY ADOPTED ACCOUNTING STANDARDS NARRATIVE (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2019	Oct. 01, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales tax		$ 45,300
Accumulated other comprehensive loss, net of tax		$ 31,787			$ 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)
Accounting Standards Update 2016-02 | Minimum | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset			$ 60,000
Operating lease liability			60,000
Accounting Standards Update 2016-02 | Maximum | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset			70,000
Operating lease liability			$ 70,000
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)
Investments in Equity Securities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification to retained earnings				3,400
Accumulated other comprehensive loss, net of tax				4,700
Home Services and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification to retained earnings				3,800
Home Services and Other | Retained Earnings | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification to retained earnings				$ 2,700

[1] See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.