Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Statement of Income and Comprehensive Income [Abstract]
Net income (loss)	$ 6,046	$ 7,648	$ 30,306
Foreign currency translation adjustments	7,553	(3,490)	(4,249)
Changes in unrealized gain (losses), net of tax	361	(672)	(23)
Investment in securities, reclassification adjustment for net losses (gains) realized in net income, net of tax	(96)	800	(32)
Net changes in market value of investments	265	128	(55)
Changes in accumulated net actuarial income (loss), net of tax	89	(1,957)	(1,423)
Defined benefit plans, reclassification adjustment for net losses realized in net income, net of tax	215	136	54
Net changes in defined benefit plan accumulated net actuarial income (loss)	304	(1,821)	(1,369)
Total comprehensive income	$ 14,168	$ 2,465	$ 24,633