Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,686)	$ (17,472)	$ (21,106)	$ (46,815)
Other comprehensive income (loss):
Cumulative translation adjustments	940	(525)	1,893	(1,086)
Changes in market value of investments:
Changes in unrealized (losses) gains, net of (benefit) taxes of ($10), $5, ($33) and $11, respectively	(33)	2	(107)	37
Total net change in market value of investments	(33)	2	(107)	37
Changes in market value of derivatives:
Changes in market value of derivatives, net of taxes (benefit) of $55, ($22), $59 and ($41), respectively	181	(5)	188	(60)
Reclassification adjustment for net gains included in net loss, net of (benefit) taxes of ($32), $11, ($22) and $21, respectively	(105)	13	(72)	49
Total net change in market value of derivatives	76	8	116	(11)
Other comprehensive income (loss)	983	(515)	1,902	(1,060)
Total comprehensive loss	$ (2,703)	$ (17,987)	$ (19,204)	$ (47,875)