RESTRUCTURING CHARGES - Summary of the Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,104	$ 9,538
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,658	3,792
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	914	1,054
Non-cash facility and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	532	4,692
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,353	4,076
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,751	$ 5,462