Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,352	$ (2,754)	$ (73,324)
Other comprehensive income (loss):
Cumulative translation adjustments	2,926	(1,644)	(3,229)
Recognition of actuarial net (losses) gains from pension and other post-retirement plans, net of (benefit) tax of ($657), $590, and ($976)	(1,548)	1,054	(2,278)
Changes in market value of investments:
Changes in unrealized (losses) gains, net of (benefit) tax of ($41), $39, and $19	(130)	126	60
Total net change in market value of investments	(130)	126	60
Changes in market value of derivatives:
Changes in market value of derivatives, net of tax (benefit) of $66, ($25), and ($172)	208	(78)	(524)
Reclassification adjustment for net (loss) gain included in net income (loss), net of (benefit) tax of ($73), $7, and $138	(236)	21	437
Total net change in market value of derivatives	(28)	(57)	(87)
Other comprehensive income (loss)	1,220	(521)	(5,534)
Total comprehensive income (loss)	$ 20,572	$ (3,275)	$ (78,858)