Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 21,348	$ 14,741	$ 23,740
Adjustments to reconcile net income to net cash provided by operating activities, net of assets acquired and liabilities assumed:
Depreciation and amortization	10,597	13,981	17,311
Provision for receivable allowances	10,854	6,795	8,935
Write-down of goodwill and other intangibles	1,391
Net change in inventory provision	2,172	1,576	2,852
Stock-based compensation	3,438	3,343	2,867
Loss (gain) on investments	(808)	605	1,785
Deferred income taxes	3,174	3,768	1,340
Foreign currency adjustments on intercompany amounts and other non-cash items	(173)	63	(5,020)
Changes in operating assets and liabilities, net of business acquired:
Accounts receivable	(14,299)	(2,238)	(7,342)
Inventories	(5,527)	(7,702)	(2,203)
Prepaid expenses and other assets	162	(1,320)	5,931
Accounts payable	(529)	(2,173)	(2,646)
Accrued expenses and other current liabilities	3,577	(693)	2,058
Pension liabilities	(840)	(1,153)	(1,414)
Net cash provided by operating activities	34,537	29,593	48,194
Cash flows from investing activities:
Purchase of businesses, net of cash and cash equivalents acquired and installment payments		(14,472)	(2,297)
Purchases of investments	(4,725)	(629)	(5,887)
Purchases of plant and equipment	(7,377)	(7,110)	(7,018)
Proceeds from sale of investments	810	26	54
Proceeds from sale of fixed assets	99
Net cash used in investing activities	(11,193)	(22,185)	(15,148)
Cash flows from financing activities:
Principal payments on capital lease obligations		(472)	(2,414)
Repayments of loans and notes payable	(9,051)	(47,606)	(1,144)
Installment payments for business acquisition			(30,000)
Proceeds from loans		82,967	30,000
Purchases of treasury stock	(1,213)	(8,352)
Payments of cash dividends to stockholders	(1,258)	(4,896)	(4,263)
Proceeds from employee equity plans	4,524	4,336	2,692
Net cash provided by (used in) financing activities	(6,998)	25,977	(5,129)
Effect of exchange rate fluctuations on cash and cash equivalents	(3,195)	1,268	(5,262)
Net increase in cash and cash equivalents	13,151	34,653	22,655
Cash and cash equivalents and restricted cash at beginning of the year (1)	156,083	121,430	98,775
Cash and cash equivalents and restricted cash at end of the year (2)	169,234	156,083	121,430
Supplemental disclosure of cash flow information
Cash paid during the period for interest	2,545	1,992	2,172
Cash paid during the period for income taxes	$ 3,985	$ 5,669	$ 1,416