EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses		$ 111,783	$ 104,493	$ 225,537	$ 211,117
Other, net		1,268	2,346	2,272	2,760
Interest cost		1,571	1,407	3,141	2,814
Expected return on plan assets		(2,583)	(2,639)	(5,166)	(5,278)
Amortization:
Prior service cost		3	4	7	8
Recognized actuarial loss		222	346	444	692
Net periodic expense (income)		$ (787)	(882)	$ (1,574)	(1,764)
Pension settlement gain	$ 13,715
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses			882		1,764
Other, net			$ (882)		$ (1,764)