PENSION PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating expenses	$ 48,193	$ 44,455	$ 89,967	$ 80,548
Pension plan contributions	5,047	145	5,093	265
Components of net periodic benefit cost:
Service cost	0	0	0	0
Interest on projected benefit obligation	261	284	522	568
Less estimated return on plan assets	298	274	597	548
Amortization of unrecognized losses	182	141	365	283
Net periodic benefit cost	145	$ 151	290	$ 303
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating expenses	(145)		(290)
Other expenses	$ 145		$ 290