Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 21,462	$ 17,383	$ 17,262	$ 10,251
Other comprehensive loss:
Cumulative translation adjustments	(138)	(310)	(70)	(561)
Changes in market value of investments:
Changes in unrealized gains (losses), net of taxes (benefit) of $3, $0, ($31) and ($3), respectively	9	0	(97)	(11)
Total net change in market value of investments	9	0	(97)	(11)
Changes in market value of derivatives:
Changes in market value of derivatives, net of benefit of $85, $237, $34, and $283, respectively	(264)	(762)	(105)	(910)
Reclassification adjustment for net (losses) gains included in net income, net of (benefit) taxes of ($10), $51, ($28) and $89, respectively	(31)	163	(87)	285
Total net change in market value of derivatives	(295)	(599)	(192)	(625)
Other comprehensive loss	(424)	(909)	(359)	(1,197)
Total comprehensive income	$ 21,038	$ 16,474	$ 16,903	$ 9,054