CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Mar. 31, 2012
Current Assets:
Cash and cash equivalents	$ 16,414	$ 19,860
Short-term investments	123,847	111,137
Trade accounts receivable, net	7,335	8,021
Inventories	11,344	14,438
Prepaid expenses and other current assets	2,538	6,786
Prepaid income taxes	3,203	3,032
Deferred income taxes	7,517	7,529
Total current assets	172,198	170,803
Long-term investments	13,800	25,900
Property, plant and equipment, net	4,334	4,941
Other assets	787	621
Deferred income taxes, noncurrent	5,659	5,375
Total assets	196,778	207,640
Current Liabilities:
Trade accounts payable	2,521	1,994
Accrued salaries and employee benefits	13,230	12,434
Other accrued liabilities	633	615
Deferred revenue	2,651	2,560
Income taxes payable	165	23
Total current liabilities	19,200	17,626
Income taxes payable, noncurrent	3,535	4,161
Deferred tax liabilities, noncurrent	115
Other accrued liabilities, noncurrent	575	561
Total liabilities	23,425	22,348
Commitments and contingencies (Note 14)
Preferred stock, no par value--10,000 shares authorized; none issued and outstanding
Common stock, no par value--30,000 shares authorized; issued and outstanding 11,526 shares as of March 30, 2013 and 11,992 shares as of March 31, 2012	68,389	68,031
Accumulated other comprehensive loss	(564)	(1,345)
Retained earnings	105,528	118,606
Total shareholders' equity	173,353	185,292
Total liabilities and shareholders' equity	$ 196,778	$ 207,640