Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect Period of Adoption Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest in Subsidiaries [Member]
Beginning balance at Mar. 31, 2018	$ 1,848,007		$ 6	$ 1,535,635	$ 285,960		$ 15,565	$ 10,841
Beginning balance, shares at Mar. 31, 2018			58,905,274
Exercise of stock options	11,087			11,087
Exercise of stock options, shares			275,000
Issuance of stock under Employee Stock Purchase Plan	15,243			15,243
Issuance of stock under Employee Stock Purchase Plan, shares			289,024
Stock-based compensation	91,470			91,470
Shares and fully-vested RSUs issued in settlement of certain accrued employee compensation liabilities, net of shares withheld for taxes which have been retired	27,701			27,701
Shares and fully-vested RSUs issued in settlement of certain accrued employee compensation liabilities, net of shares withheld for taxes which have been retired, shares			438,433
RSU awards vesting, net of shares withheld for taxes which have been retired	(24,398)			(24,398)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares			642,362
Other noncontrolling interest activity	(3,584)			81				(3,665)
Net (loss) income	(66,469)				(67,623)			1,154
Other comprehensive income (loss), net of tax	(10,227)						(10,227)
Ending balance at Mar. 31, 2019	1,916,078	$ 27,248	$ 6	1,656,819	245,585	$ 27,248	5,338	8,330
Accounting Standards Update [Extensible List]		Accounting Standards Update 2014-09 [Member]				Accounting Standards Update 2014-09 [Member]
Ending balance, shares at Mar. 31, 2019			60,550,093
Exercise of stock options	21,060			21,060
Exercise of stock options, shares			340,373
Issuance of stock under Employee Stock Purchase Plan	17,350			17,350
Issuance of stock under Employee Stock Purchase Plan, shares			311,137
Stock-based compensation	99,200			99,200
Shares issued in settlement of certain accrued employee compensation liabilities	22,829			22,829
Shares issued in settlement of certain accrued employee compensation liabilities, shares			255,615
RSU awards vesting, net of shares withheld for taxes which have been retired	(28,802)			(28,802)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares			689,922
Net (loss) income	13,813				(212)			14,025
Other comprehensive income (loss), net of tax	(11,386)						(11,386)
Ending balance at Mar. 31, 2020	2,050,142		$ 6	1,788,456	245,373		(6,048)	22,355
Ending balance, shares at Mar. 31, 2020			62,147,140
Issuance of stock under Employee Stock Purchase Plan	19,101			19,101
Issuance of stock under Employee Stock Purchase Plan, shares			638,792
Common stock issued in private placement, net of issuance costs	174,749		$ 1	174,748
Common stock issued in private placement, net of issuance costs, shares			4,474,559
Stock-based compensation	98,560			98,560
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	(13,676)			(13,676)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares			687,796
Net (loss) income	17,101				3,691			13,410
Other comprehensive income (loss), net of tax	15,851						15,851
Ending balance at Mar. 31, 2021	$ 2,387,234		$ 7	$ 2,092,595	$ 249,064		$ 9,803	$ 35,765
Ending balance, shares at Mar. 31, 2021			68,529,133