RESTRUCTURING CHARGES - Summary of the Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 10,800	$ 6,434
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,482	2,134
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,524	140
Non-cash facility and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,794	4,160
Cost of goods and services
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,425	2,723
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,375	$ 3,711