Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 6,046	$ 7,648	$ 30,306
Adjustments to reconcile net income to net cash provided by operating activities, net of assets acquired and liabilities assumed:
Depreciation and amortization	21,274	12,492	13,467
Provision for receivable allowances	8,563	10,064	8,524
Write-down of goodwill and other intangibles	0	0	6,448
Write-down of marketable equity securities	7	1,342	0
Net change in inventory provision	1,724	1,295	1,322
Stock-based compensation	2,785	3,451	3,779
Deferred income taxes	(551)	2,495	1,696
Tax impacts due to employee equity incentive plans	(152)	38	(663)
Loss on disposal of plant and equipment	0	0	71
Gain on investments	(542)	(362)	(217)
Other non-cash items, net	854	220	(1,212)
Changes in operating assets and liabilities, net of business acquired:
Accounts receivable	(14,755)	(487)	(2,795)
Inventories	(6,296)	(839)	(13,420)
Prepaid expenses and other current assets	(5,518)	(3,878)	2,842
Other assets	(968)	832	540
Accounts payable	2,067	(1,304)	(2,006)
Accrued expenses and other liabilities	5,698	(744)	(3,634)
Pension liabilities	(907)	(626)	(602)
Net cash provided by (used in) operating activities	19,329	31,637	44,446
Cash flows from investing activities:
Change in restricted cash	(23)	195	84
Purchase of businesses, net of deferred payments	(20,000)	0	0
Purchases of investments	0	(4,538)	(1,048)
Purchases of plant and equipment	(7,623)	(7,192)	(11,842)
Proceeds from sale of investments	512	453	431
Net cash used in investing activities	(27,134)	(11,082)	(12,375)
Cash flows from financing activities:
Principal payments on capital lease obligations	(2,570)	(2,774)	(3,222)
Repayments of loans and notes payable	(1,000)	(1,667)	(1,374)
Proceeds from loans	0	0	423
Tax impacts due to employee equity incentive plans	152	(38)	663
Purchases of treasury stock	(602)	(6,505)	(7,576)
Payment of cash dividends to stockholders	(3,744)	(1,854)	0
Proceeds from employee equity plans	4,420	1,982	3,379
Net cash used in financing activities	(3,344)	(10,856)	(7,707)
Effect of exchange rate fluctuations on cash and cash equivalents	2,471	(1,187)	(1,166)
Net increase (decrease) in cash and cash equivalents	(8,678)	8,512	23,198
Cash and cash equivalents at beginning of the year	107,116	98,604	75,406
Cash and cash equivalents at end of the year	98,438	107,116	98,604
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	801	897	1,129
Cash paid during the period for income taxes	4,760	126	11,329
Supplemental disclosure of noncash investing and financing activities:
Fixed assets acquired under capital leases and loans	$ 0	$ 0	$ 5,764