CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Apr. 02, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (54,716)	$ 4,904	$ 7,934
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	9,905	12,489	10,317
Amortization of acquired intangible assets	4,746	1,722	1,964
Share-based compensation expense	7,861	11,451	9,309
Provision for (recovery of) doubtful accounts	0	50	(150)
Loss on sale of property and equipment, net	680	1,007	106
Gain on sale of previously impaired auction rate securities	0	(2,729)	0
Decrease (increase) in deferred income taxes	40,971	(5,724)	(2,752)
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	1,232	11,191	(5,755)
Decrease (increase) in inventories	3,564	(4,389)	3,108
Decrease (increase) in shipped systems pending acceptance	353	3,929	(1,183)
Decrease in other current assets	633	2,559	2,228
Increase (decrease) in accounts payable and accrued liabilities	2,550	(16,886)	22,706
(Decrease) increase in deferred revenue	(672)	(5,261)	2,758
Net cash provided by operating activities	17,107	14,313	50,590
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(1,061,654)	(929,201)	(471,112)
Proceeds from sales and maturities of investments	1,123,156	876,822	509,935
Proceeds from sale of auction rate securities	0	6,450	0
Purchase of property, plant and equipment	(6,213)	(4,937)	(6,556)
Proceeds from sale of property, plant and equipment	2,030	26	0
Decrease (increase) in restricted cash	22,269	(11,500)	55
Cash paid to acquire subsidiaries	(9,466)	0	(8,075)
Minority equity investment	0	0	(782)
Decrease (increase) in other assets	625	(131)	487
Net cash provided by (used in) investing activities	70,747	(62,471)	23,952
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividends paid to shareholders	(68,077)	(2,303)	0
Stock plan activity, net	627	2,999	1,259
Excess tax benefit of share-based compensation	307	546	252
Net cash (used in) provided by financing activities	(67,143)	1,242	1,511
Effect of exchange rate changes on cash	(1,578)	284	1,024
NET CHANGE IN CASH AND CASH EQUIVALENTS	19,133	(46,632)	77,077
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	69,780	116,412	39,335
CASH AND CASH EQUIVALENTS AT END OF PERIOD	88,913	69,780	116,412
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	(21)	0	0
Cash paid for income taxes	(1,823)	(4,371)	(2,026)
Income tax refunds received	$ 890	$ 132	$ 3,360