Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (24,507)	$ 17,629	$ (24,753)	$ 40,338
Other comprehensive income (loss):
Cumulative translation adjustments	(568)	(1,290)	285	(3,397)
Changes in market value of investments:
Changes in unrealized losses	(125)	(75)	(67)	(54)
Total net change in market value of investments	(125)	(75)	(67)	(54)
Changes in market value of derivatives:
Changes in market value of derivatives, net of tax benefit of ($108), ($327), ($314) and ($595)	(180)	(597)	(492)	(1,068)
Reclassification adjustment for net gains included in net income, net of taxes of $60, $133, $718 and $115	99	214	1,231	195
Total net change in market value of derivatives	(81)	(383)	739	(873)
Other comprehensive income (loss)	(774)	(1,748)	957	(4,324)
Total comprehensive income (loss)	$ (25,281)	$ 15,881	$ (23,796)	$ 36,014