CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (10,701)	$ 11,035
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	5,636	6,867
Amortization of acquired intangible assets	2,133	1,810
Share-based compensation expense	5,130	6,132
Gain on sale of property and equipment, net	1,264	1,226
Gain on acquisition of Semiconductor Systems business	(499)	0
Other than temporary impairment of cost based investments	3,588	0
Decrease (increase) in deferred income taxes	(317)	4,537
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	8,047	14,315
Decrease (increase) in inventories	(1,389)	(11,744)
Decrease (increase) in shipped systems pending acceptance	(172)	1,002
Decrease (increase) in other current assets	(924)	61
Increase (decrease) in accounts payable and accrued liabilities	(9,460)	(912)
Increase (decrease) in deferred revenue	(3,681)	(4,343)
Net cash (used in) provided by operating activities	(3,873)	27,534
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(237,113)	(857,435)
Proceeds from sales and maturities of investments	253,265	885,818
Purchase of property, plant and equipment	(5,344)	(5,127)
Proceeds from sale of property, plant, and equipment	3,617	2,020
Cash paid for business acquisitions	(9,731)	(9,466)
Minority equity investment	(5,000)	0
Decrease (increase) in other assets	(408)	403
Net cash (used in) provided by investing activities	(714)	16,213
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividends paid to shareholders	(7,158)	(65,723)
Stock plan activity, net	83	73
Excess tax benefit of share-based compensation	0	71
Net cash (used in) provided by financing activities	(7,075)	(65,579)
Effect of exchange rate changes on cash	(77)	(708)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(11,739)	(22,540)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	88,913	69,780
CASH AND CASH EQUIVALENTS AT END OF PERIOD	77,174	47,240
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	(3,072)	(1,174)
Income tax refunds received	$ 65	$ 651