Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 36,725	$ (3,603)	$ (10,090)	$ (92,535)
Other comprehensive income (loss):
Cumulative translation adjustments	297	(1,170)	(789)	(3,319)
Changes in market value of investments:
Changes in unrealized gains, net of taxes of $1, $12, $12 and $21, respectively	3	12	40	35
Total net change in market value of investments	3	12	40	35
Changes in market value of derivatives:
Changes in market value of derivatives, net of taxes (benefit) of $40, ($53), $6 and ($193), respectively	84		18
Changes in market value of derivatives, net of taxes (benefit) of $40, ($53), $6 and ($193), respectively		(162)		(601)
Reclassification adjustment for net (losses) gains included in net income (loss), net of (benefit) taxes of ($7), $51, $8 and $122, respectively	(30)		25
Reclassification adjustment for net (losses) gains included in net income (loss), net of (benefit) taxes of ($7), $51, $8 and $122, respectively		157		382
Total net change in market value of derivatives	54		43
Total net change in market value of derivatives		(5)		(219)
Other comprehensive income (loss)	354	(1,163)	(706)	(3,503)
Total comprehensive income (loss)	$ 37,079	$ (4,766)	$ (10,796)	$ (96,038)