RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre-tax	$ 3,104		$ 9,538
Non-cash charges	532	$ 4,160	4,692
Restructuring costs			4,846
Impairment charge, operating lease			1,968
Impairment charge, leasehold improvements			671
Inventory write down			304
Impairment charge, manufacturing assets			$ 1,749
Reduction of headcount | position			148
One-time charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	35,000		$ 35,000
Capital investments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40,000		40,000
Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	16,000		16,000
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	12,000		12,000
Restructuring charges, pre-tax	1,658		3,792
Non-cash charges	0	0
Restructuring costs			3,792
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	4,000		4,000
Restructuring charges, pre-tax	914		1,054
Non-cash charges	0	$ 0
Restructuring costs			1,054
Asset write-downs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 19,000		$ 19,000