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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Recently issued accounting updates (Details) - USD ($) $ in Thousands		6 Months Ended
	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2018
New accounting pronouncements
Change in prepaid expenses and other		$ 3,960	$ 6,992
Change in accrued liabilities		(456)	12,918
Cash provided by operating activities		409,018	207,651
Payment of contingent consideration from acquisition of business			(4,500)
Cash used in financing activities		$ (164,503)	(162,079)
As Reported
New accounting pronouncements
Change in prepaid expenses and other			835
Change in accrued liabilities			8,418
Cash provided by operating activities			196,994
Cash used in financing activities			(157,579)
ASU 2016-18 | Adjustments
New accounting pronouncements
Change in prepaid expenses and other			6,157
Cash provided by operating activities			6,157
ASU 2016-15 | Adjustments
New accounting pronouncements
Change in accrued liabilities			4,500
Cash provided by operating activities			4,500
Payment of contingent consideration from acquisition of business			(4,500)
Cash used in financing activities			$ (4,500)
ASU 2016-01 | Adjustments
New accounting pronouncements
Reclassification adjustment before tax	$ 44,000
Reclassification adjustment after-tax	29,100
ASU 2016-01 | Adjustments | Accumulated Other Comprehensive Income
New accounting pronouncements
Reclassification adjustment after-tax	$ 29,071

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