Condensed Consolidated Statement of Equity (Unaudited) - 3 months ended Jun. 30, 2016 - 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, 2016	$ 1,134,424	$ 5	$ 855,387	$ 273,704	$ 7	$ 5,321
Beginning balance, shares at Mar. 31, 2016		48,926,417
Exercise of stock options	1,817		1,817
Exercise of stock options, shares		35,975
Issuance of stock under Employee Stock Purchase Plan	4,892		4,892
Issuance of stock under Employee Stock Purchase Plan, shares		94,339
Stock-based compensation	14,398		14,398
Shares issued in settlement of certain accrued employee compensation liabilities	13,080		13,080
Shares issued in settlement of certain accrued employee compensation liabilities, shares		176,731
RSU awards vesting, net of shares withheld for taxes which have been retired	(1,937)		(1,937)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		45,985
Other noncontrolling interest activity	(13)					(13)
Net income	2,157			1,855		302
Other comprehensive (loss) income, net of tax	(864)				(864)
Ending balance at Jun. 30, 2016	$ 1,167,954	$ 5	$ 887,637	$ 275,559	$ (857)	$ 5,610
Ending balance, shares at Jun. 30, 2016		49,279,447