RESTRUCTURING CHARGES - Summary of the Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,082	$ 1,633	$ 22,444	$ 11,171
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	700	1,050	3,964	4,842
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,190	583	8,997	1,637
Non-cash facility and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,192	0	9,483	4,692
Cost of goods and services
Restructuring Cost and Reserve [Line Items]
Restructuring charges	696	20	10,458	4,096
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,386	$ 1,613	$ 11,986	$ 7,075