RESTRUCTURING CHARGES - Summary of the Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,633	$ 11,171
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,050	4,842
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	583	1,637
Non-cash facility and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	4,692
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20	4,096
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,613	$ 7,075