Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 30,306	$ 36,647	$ (677)
Adjustments to reconcile net income (loss) to net cash provided by operating activities, net of assets acquired and liabilities assumed:
Depreciation and amortization	13,467	18,059	13,386
Provision for receivable allowances	8,524	8,534	4,864
Write-down of goodwill and other intangibles	6,448	702	0
Net change in inventory provision	1,322	(4,395)	2,059
Stock-based compensation	3,779	3,398	3,160
Foreign currency adjustments on intercompany amounts	(1,212)	3,442	(101)
Deferred income taxes	1,696	(5,398)	(1,358)
Tax benefit from employee equity incentive plans	(663)	(305)	(1,219)
Loss (gain) on disposal of plant and equipment	71	217	(364)
Loss (gain) on investments	(217)	(358)	249
Changes in operating assets and liabilities, net of business acquired:
Accounts receivable	(2,795)	(15,279)	(12,182)
Inventories	(13,420)	(3,403)	12,305
Prepaid expenses and other current assets	2,842	488	2,849
Other assets	540	(889)	236
Accounts payable	(2,006)	(1,407)	2,814
Accrued expenses and other liabilities	(3,634)	(5,608)	3,201
Pension liabilities	(602)	(578)	(56)
Net cash provided by operating activities	44,446	33,867	29,166
Cash flows from investing activities:
Change in restricted cash	84	220	(413)
Purchase of businesses, net of cash and cash equivalents acquired	0	0	(30,631)
Purchases of investments	(1,048)	(561)	(618)
Purchases of plant and equipment	(11,842)	(8,855)	(5,142)
Proceeds from sale of investments	431	255	506
Proceeds from sale of fixed assets	0	0	42
Net cash used in investing activities	(12,375)	(8,941)	(36,256)
Cash flows from financing activities:
Principal payments on capital lease obligations	(3,222)	(3,120)	(3,961)
Repayments of loans and notes payable	(1,374)	(8,447)	(1,514)
Proceeds from loans	423	0	15,000
Tax benefit from employee equity incentive plans	663	305	1,219
Purchases of treasury stock	(7,576)	(4,005)	(288)
Proceeds from employee equity plans	3,379	3,866	1,319
Net cash provided by (used in) financing activities	(7,707)	(11,401)	11,775
Effect of exchange rate fluctuations on cash and cash equivalents	(1,166)	1,357	398
Net increase in cash and cash equivalents	23,198	14,882	5,083
Cash and cash equivalents at beginning of the year	75,406	60,524	55,441
Cash and cash equivalents at end of the year	98,604	75,406	60,524
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	1,129	1,045	1,629
Cash paid during the period for income taxes	11,329	14,238	1,760
Supplemental disclosure of noncash investing and financing activities:
Fixed assets acquired under capital leases and loans	$ 5,764	$ 4,780	$ 0