INCOME TAXES - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets:
Deferred compensation expense/accrued bonus	$ 53,397	$ 48,501
Allowance for doubtful accounts	1,078	675
US foreign tax credits	2,478	2,523
Operating lease liabilities	27,977	0
Other, net	15,497	16,396
Total deferred tax assets	100,427	68,095
Deferred tax asset valuation allowance	(11,097)	(11,369)
Total deferred tax assets	89,330	56,726
Deferred tax liabilities:
Intangibles	(49,166)	(51,676)
Accounts receivable and work in process	(561)	(1,647)
Operating lease right-of-use assets	(25,131)	0
Other, net	(8,629)	(8,607)
Total deferred tax liabilities	(83,487)	(61,930)
Net deferred tax assets/(liabilities)	$ 5,843
Net deferred tax assets/(liabilities)		$ (5,204)