Statement of Cash Flows (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 9,976	$ 6,526
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,377	4,708
Provision for receivable allowances	2,434	1,930
Net change in inventory provision	262	(2,250)
Foreign currency adjustments on intercompany amounts	471	(2,268)
Stock-based compensation	784	792
(Gain) on investments and disposal of fixed assets	127	14
Changes in operating assets and liabilities:
Accounts receivable	(5,060)	(8,144)
Inventories	500	(2,454)
Prepaid expenses and other current assets	877	(564)
Other assets	80	88
Accounts payable	(925)	502
Increase Decrease In Other Accounts Payable And Accrued Liabilities	2,366	2,564
Increase Decrease In Pension Plan Obligations	(190)	(101)
Net cash provided by operating activities	15,079	1,343
Cash flows from investing activities:
Change in restricted cash	(7)	(31)
Purchases of investments	(8)	(35)
Purchases of property and equipment	(3,019)	(1,361)
Proceeds from sale of investments	25	0
Net cash used in investing activities	(3,009)	(1,427)
Cash flows from financing activities:
Principal payments on capital lease obligations	(774)	(784)
Repayments of loans and notes payable	(340)	(338)
Proceeds from line of credit	423	0
Proceeds from employee equity plans	1,443	409
Purchase of treasury stock	(1,550)	(1,027)
Net cash provided by (used in) financing activities	(798)	(1,740)
Effect of exchange rate fluctuations on cash and cash equivalents	384	(1,277)
Net increase in cash and cash equivalents	11,656	(3,101)
Cash and cash equivalents at beginning of period	75,406	60,524
Cash and cash equivalents at end of period	$ 87,062	$ 57,423