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	16,071		16,071
Exercise of stock options, shares		259,125
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	24,312		24,312
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	(2,328)		(2,328)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		46,330
Net (loss) income	(9,737)			(11,468)		1,731
Other comprehensive loss, net of tax	(2,239)				(2,239)
Ending balance at Jun. 30, 2019	1,973,292	$ 6	1,726,009	234,117	3,099	10,061
Ending balance, shares at Jun. 30, 2019		61,276,933
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