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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Recently issued accounting updates (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Oct. 01, 2017
New accounting pronouncements
Net cash provided by operating activities		$ 544,531	$ 361,631	$ 754,531
Net cash used in financing activities		(309,189)	(300,829)	(344,135)
Retained earnings		(4,027,779)	(3,855,686)
ASU 2016-09 \| Adjustments
New accounting pronouncements
Net cash provided by operating activities			4,400	900
Net cash used in financing activities			(4,400)	$ (900)
Retained earnings					$ 300
ASU 2016-18 \| Adjustments
New accounting pronouncements
Net cash provided by operating activities		$ 2,700	$ 9,500
ASU 2016-01 \| Adjustments
New accounting pronouncements
Reclassification adjustment	$ 44,000