Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,468)	$ (1,266)	$ (26,690)	$ (10,264)
Other comprehensive income (loss):
Cumulative translation adjustments	2,495	171	3,630	(87)
Changes in market value of investments:
Changes in unrealized gains (losses), net of taxes of $8, $0, $5 and $0, respectively	13	(80)	9	(39)
Total net change in market value of investments	13	(80)	9	(39)
Changes in market value of derivatives:
Changes in market value of derivatives, net of taxes (benefits) of $153, ($34), $343 and ($52), respectively	262	(54)	566	(85)
Reclassification adjustment for net gains included in net loss, net of taxes (benefits) of ($143), ($4), ($139), and $4, respectively	(236)	(7)	(228)	7
Total net change in market value of derivatives	26	(61)	338	(78)
Other comprehensive income (loss)	2,534	30	3,977	(204)
Total comprehensive income (loss)	$ 66	$ (1,236)	$ (22,713)	$ (10,468)