Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest in Subsidiaries [Member]
Beginning balance at Mar. 31, 2020	$ 2,050,142	$ 6	$ 1,788,456	$ 245,373	$ (6,048)	$ 22,355
Beginning balance, shares at Mar. 31, 2020		62,147,140
Issuance of stock under Employee Stock Purchase Plan	9,206		9,206
Issuance of stock under Employee Stock Purchase Plan, shares		282,269
Stock-based compensation	24,160		24,160
Shares issued in settlement of certain accrued employee compensation liabilities	25,406		25,406
Shares issued in settlement of certain accrued employee compensation liabilities, shares		580,846
RSU awards vesting, net of shares withheld for taxes which have been retired	(401)		(401)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		15,746
Net (loss) income	(8,527)			(12,389)		3,862
Other comprehensive loss, net of tax	(803)				(803)
Ending balance at Jun. 30, 2020	2,099,183	$ 6	1,846,827	232,984	(6,851)	26,217
Ending balance, shares at Jun. 30, 2020		63,026,001
Beginning balance at Mar. 31, 2021	2,387,234	$ 7	2,092,595	249,064	9,803	35,765
Beginning balance, shares at Mar. 31, 2021		68,529,133
Exercise of stock options	11		11
Exercise of stock options, shares		363
Issuance of stock under Employee Stock Purchase Plan	8,706		8,706
Issuance of stock under Employee Stock Purchase Plan, shares		313,700
Stock-based compensation	27,512		27,512
Shares issued in settlement of certain accrued employee compensation liabilities	24,488		24,488
Shares issued in settlement of certain accrued employee compensation liabilities, shares		457,130
RSU awards vesting, net of shares withheld for taxes which have been retired	(458)		(458)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		20,339
Shares issued in connection with acquisition of business	207,169		207,169
Shares issued in connection with acquisition of business, shares		4,000,189
Other	78					78
Net (loss) income	18,012			16,968		1,044
Other comprehensive loss, net of tax	(15,742)				(15,742)
Ending balance at Jun. 30, 2021	$ 2,657,010	$ 7	$ 2,360,023	$ 266,032	$ (5,939)	$ 36,887
Ending balance, shares at Jun. 30, 2021		73,320,854