CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 70,956	$ 69,780
Restricted cash	22,269	22,269
Short-term investments	101,700	106,674
Trade receivables, net of allowances of $443 and $390	58,371	32,744
Inventories	79,318	68,055
Shipped systems pending acceptance	262	1,360
Deferred income taxes, net	9,046	10,021
Other current assets	4,539	4,060
Total current assets	346,461	314,963
Non-current investments	10,508	23,046
Property, plant and equipment, net of accumulated depreciation of $105,144 and $101,716	30,937	32,103
Non-current deferred income taxes, net	34,686	36,489
Goodwill	7,889	4,014
Acquired intangible assets, net of accumulated amortization of $11,767 and $10,609	12,714	8,332
Other assets	16,451	14,263
Total assets	459,646	433,210
Current liabilities:
Accounts payable	30,559	13,045
Accrued liabilities	27,824	21,635
Deferred revenue	9,456	10,751
Total current liabilities	67,839	45,431
Non-current income taxes payable	9,335	9,109
Commitments and contingencies
Shareholders' equity:
Preferred stock, without par value; 1,000 shares authorized; no shares issued
Common stock, without par value; 100,000 shares authorized; 29,391 and 28,970 issued and outstanding	172,064	168,143
Retained earnings	209,615	210,021
Accumulated other comprehensive income	793	506
Total shareholders' equity	382,472	378,670
Total liabilities and shareholders' equity	$ 459,646	$ 433,210