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 Subsidiary [Member]
Beginning balance at Mar. 31, 2019	$ 1,916,078	$ 6	$ 1,656,819	$ 245,585	$ 5,338	$ 8,330
Beginning balance, shares at Mar. 31, 2019		60,550,093
Exercise of stock options	18,710		18,710
Exercise of stock options, shares		301,731
Issuance of stock under Employee Stock Purchase Plan	8,306		8,306
Issuance of stock under Employee Stock Purchase Plan, shares		165,770
Stock-based compensation	48,388		48,388
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	(3,128)		(3,128)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		79,351
Net income (loss)	(1,675)			(8,274)		6,599
Other comprehensive income (loss), net of tax	(3,672)				(3,672)
Ending balance at Sep. 30, 2019	2,005,836	$ 6	1,751,924	237,311	1,666	14,929
Ending balance, shares at Sep. 30, 2019		61,352,560
Beginning balance at Jun. 30, 2019	1,973,292	$ 6	1,726,009	234,117	3,099	10,061
Beginning balance, shares at Jun. 30, 2019		61,276,933
Exercise of stock options	2,639		2,639
Exercise of stock options, shares		42,606
Stock-based compensation	24,076		24,076
RSU awards vesting, net of shares withheld for taxes which have been retired	(800)		(800)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		33,021
Net income (loss)	8,062			3,194		4,868
Other comprehensive income (loss), net of tax	(1,433)				(1,433)
Ending balance at Sep. 30, 2019	2,005,836	$ 6	1,751,924	237,311	1,666	14,929
Ending balance, shares at Sep. 30, 2019		61,352,560
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
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	50,456		50,456
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	(747)		(747)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		48,055
Net income (loss)	(5,136)			(10,426)		5,290
Other comprehensive income (loss), net of tax	3,615				3,615
Ending balance at Sep. 30, 2020	2,307,691	$ 7	2,047,525	234,947	(2,433)	27,645
Ending balance, shares at Sep. 30, 2020		67,532,869
Beginning balance at Jun. 30, 2020	2,099,183	$ 6	1,846,827	232,984	(6,851)	26,217
Beginning balance, shares at Jun. 30, 2020		63,026,001
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	26,296		26,296
RSU awards vesting, net of shares withheld for taxes which have been retired	(346)		(346)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		32,309
Net income (loss)	3,391			1,963		1,428
Other comprehensive income (loss), net of tax	4,418				4,418
Ending balance at Sep. 30, 2020	$ 2,307,691	$ 7	$ 2,047,525	$ 234,947	$ (2,433)	$ 27,645
Ending balance, shares at Sep. 30, 2020		67,532,869