Condensed Consolidated Statement of Equity (Unaudited) - 3 months ended Jun. 30, 2017 - 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, 2017	$ 1,737,931	$ 6	$ 1,439,645	$ 297,471	$ (2,504)	$ 3,313
Beginning balance, shares at Mar. 31, 2017		57,600,609
Exercise of stock options	1,228		1,228
Exercise of stock options, shares		29,375
Issuance of stock under Employee Stock Purchase Plan	6,017		6,017
Issuance of stock under Employee Stock Purchase Plan, shares		106,937
Stock-based compensation	17,290		17,290
Shares issued in settlement of certain accrued employee compensation liabilities	16,409		16,409
Shares issued in settlement of certain accrued employee compensation liabilities, shares		228,791
RSU awards vesting, net of shares withheld for taxes which have been retired	(1,931)		(1,931)
RSU awards vesting, net of shares withheld for taxes which have been retired, shares		45,297
Net loss	(9,246)			(9,039)		(207)
Other comprehensive income, net of tax	3,617				3,617
Ending balance at Jun. 30, 2017	1,830,436	$ 6	1,479,768	346,443	$ 1,113	$ 3,106
Ending balance, shares at Jun. 30, 2017		58,011,009
Cumulative effect adjustment upon adoption of new stock compensation guidance (ASU 2016-09)	$ 59,121		$ 1,110	$ 58,011