RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($) leasedOfficeSpace
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 0	$ 397	$ 149	$ 575
Number of leased office space exited | leasedOfficeSpace							8
ROU asset group impairments and adjustments						$ 26,500	$ 26,500
Operating lease, ROU asset, impairment loss							22,200
Leasehold improvements, impairment loss							4,300
Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			423
Restructuring reserve	1,903		1,903		$ 5,434
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			100		7,900	4,200
Employee Severance | Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			149
Restructuring reserve	142		142		3,529
Employee Severance | Restructuring Activity 2025
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	100		100
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							$ 2,500
Restructuring reserve	1,200		1,200
Facility Closing | Restructuring Activity 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			7,900
Restructuring reserve related charges			500
Restructuring reserve	$ 600		600
United States, Europe and Asia Pacific | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve related charges					7,700	4,000
United States
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace							5
United States | Employee Severance | Restructuring Activity 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					200
United States | Employee Severance | Restructuring Activity 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					$ 200
United States and Europe | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			0
United States and Europe | Employee Severance | Restructuring Activity 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						200
United States and Europe | Employee Severance | Restructuring Activity 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						$ 200
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
San Francisco
Restructuring Cost and Reserve [Line Items]
Number of leased office space exited | leasedOfficeSpace							2
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
San Francisco and Phoenix | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring reserve related charges			$ (200)