RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended		15 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) leasedOfficeSpace	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 1,383	$ 2,962	$ 1,471	$ 3,701
ROU asset group impairments and adjustments	1,918	$ 10,170	1,946	$ 10,170	$ 24,600
Operating lease, ROU asset, impairment loss			1,700		20,500
Leasehold improvements	200		$ 200		4,100	$ 4,100		$ 200
Number of leased office space exited | leasedOfficeSpace			8
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			$ 1,500			$ 7,800	$ 1,700
Restructuring reserve	100		100					100
Employee Severance | Restructuring Activity 2024
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,400		1,400					1,400
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			400					3,300
Restructuring reserve related charges					$ 2,900
Restructuring reserve	2,300		2,300					2,300
Facility Closing | Restructuring Activity 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			7,300
Restructuring reserve	$ 1,700		1,700					$ 1,700
United States and Asia Pacific | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve related charges			$ 1,400
United States and Europe | Employee Severance | Restructuring Activity 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							100
United States
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			5
United States | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve related charges							$ 1,700
San Francisco
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			2
Boston
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1
Philadelphia
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1
Phoenix
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1
Europe
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			3
The Netherlands
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1
London, England
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1
Paris, France
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace			1