CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (43,811)	$ (38,334)	$ (54,716)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	7,817	7,642	9,905
Amortization of Intangible Assets	1,502	2,985	4,746
Share-based compensation expense	4,542	6,105	7,861
Provision for (recovery of) doubtful accounts	53	0	0
Gain on sale of property and equipment, net	(6)	(1,138)	680
Gain on acquisition of Semiconductor Systems business	0	(499)	0
Other than temporary impairment of cost based investments	4,263	9,703	0
Goodwill, Impairment Loss	7,889	0	0
Decrease (increase) in deferred income taxes	(54)	4,377	40,971
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	(7,965)	(2,195)	1,232
Decrease (increase) in inventories	1,091	7,567	3,564
Decrease (increase) in shipped systems pending acceptance	(462)	(1,047)	353
Decrease (increase) in other current assets	(200)	(728)	633
Increase (decrease) in accounts payable and accrued liabilities	(4,013)	(13,694)	2,550
Increase (decrease) in deferred revenue	1,861	140	(672)
Net cash (usedin) provided by operating activities	(27,493)	(19,116)	17,107
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(414,705)	(268,132)	(1,061,654)
Proceeds from sales and maturities of investments	450,507	294,182	1,123,156
Purchase of property, plant and equipment	(5,374)	(7,583)	(6,213)
Proceeds from sale of property, plant and equipment	154	3,657	2,030
Decrease (increase) in restricted cash	0	0	22,269
Cash paid for business acquisitions, net of cash acquired	7,737	9,731	9,466
Minority equity investment	0	(5,000)	0
Decrease (increase) in other assets	(2,638)	438	625
Net cash provided by (used in) investing activities	20,207	7,831	70,747
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividends paid to shareholders	(7,266)	(9,557)	(68,077)
Payment of withholding taxes on stock-based compensation	(1,850)	(1,589)	(1,910)
Stock plan activity, net	1,863	2,237	2,537
Stock Repurchased During Period, Value	(1,456)	(191)	0
Excess tax benefit of share-based compensation	0	0	307
Net cash (used in) provided by financing activities	(8,709)	(9,100)	(67,143)
Effect of exchange rate changes on cash	(1,472)	(67)	(1,578)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(17,467)	(20,452)	19,133
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	68,461	88,913	69,780
CASH AND CASH EQUIVALENTS AT END OF PERIOD	50,994	68,461	88,913
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	(109)	0	(21)
Cash paid for income taxes	(1,157)	(3,256)	(1,823)
Income tax refunds received	$ 633	$ 163	$ 890