CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Apr. 02, 2011
Current assets:
Cash and cash equivalents	$ 69,780	$ 116,412
Restricted cash	22,269	10,769
Short-term investments	106,674	69,245
Trade receivables, net of allowances of $390 and $429	32,744	44,100
Inventories	68,055	65,362
Shipped systems pending acceptance	1,360	5,289
Deferred income taxes, net	10,021	9,892
Other current assets	4,060	6,784
Total current assets	314,963	327,853
Non-current assets:
Non-current investments	23,046	8,097
Auction rate securities		5,166
Property, plant and equipment, net	32,103	39,661
Non-current deferred income taxes, net	36,489	30,822
Goodwill	4,014	4,014
Acquired intangible assets, net	8,332	10,035
Other assets	14,263	14,519
Total assets	433,210	440,167
Current liabilities:
Accounts payable	13,045	18,650
Accrued liabilities	21,635	33,425
Deferred revenue	10,751	16,039
Total current liabilities	45,431	68,114
Non-current liabilities:
Income taxes payable	9,109	9,754
Commitments and contingencies (Notes 18 and 21)
Shareholders' equity:
Preferred stock, without par value; 1,000 shares authorized; no shares issued
Common stock, without par value; 100,000 shares authorized; 28,970 and 28,299 issued and outstanding	168,143	153,189
Retained earnings	210,021	207,420
Accumulated other comprehensive income related to auction rate securities		1,445
Accumulated other comprehensive income, other	506	245
Total shareholders' equity	378,670	362,299
Total liabilities and shareholders' equity	$ 433,210	$ 440,167