NEW ACCOUNTING STANDARDS - Balance Sheet Impacts (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current liabilities	$ 174,231	$ 164,878	$ 123,303
Retained Earnings	137,124	209,132	250,707
Balance without Adoption of ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current liabilities	135,778		123,303
Retained Earnings	175,577		$ 250,707
Accounting Standards Update 2014-09 | Effect of Change Higher/(Lower)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current liabilities	38,453	41,575
Retained Earnings	$ (38,453)	$ (41,575)