RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2019 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre-tax	$ 6,434
Non-cash charges	4,160
Restructuring costs	2,274
Impairment charge, operating lease	1,740
Impairment charge, leasehold improvements	671
Impairment charge, manufacturing assets	$ 1,749
Reduction of headcount | position	28
One-time charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 35,000
Capital investments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40,000
Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	16,000
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	12,000
Restructuring charges, pre-tax	2,134
Non-cash charges	0
Restructuring costs	2,134
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	4,000
Restructuring charges, pre-tax	140
Non-cash charges	0
Restructuring costs	140
Asset write-downs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 19,000