CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (6,364)	$ (8,251)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,900	1,957
Amortization of acquired intangible assets	357	539
Share-based compensation expense	1,387	1,330
Gain on sale of property and equipment, net	3	(19)
Provision for Doubtful Accounts	127	0
Decrease (increase) in deferred income taxes	(44)	(103)
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	(5,338)	4,958
Decrease (increase) in inventories	(552)	(1,609)
Decrease (increase) in shipped systems pending acceptance	389	(493)
Decrease (increase) in other current assets	961	234
Increase (decrease) in accounts payable and accrued liabilities	6,916	441
Increase (decrease) in deferred revenue	2,585	1,753
Net cash (used in) provided by operating activities	2,327	737
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(162,395)	(133,765)
Proceeds from sales and maturities of investments	164,346	152,328
Purchase of property, plant and equipment	(1,344)	(1,158)
Proceeds from sale of property, plant, and equipment	0	105
Decrease (increase) in other assets	(138)	(276)
Net cash (used in) provided by investing activities	469	17,234
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividends paid to shareholders	0	(2,417)
Payments Related to Tax Withholding for Share-based Compensation	(531)	(1,100)
Proceeds from Issuance of Common Stock	401	485
Payments for Repurchase of Common Stock	0	(1,330)
Net cash (used in) provided by financing activities	(130)	(4,362)
Effect of exchange rate changes on cash	171	389
NET CHANGE IN CASH AND CASH EQUIVALENTS	2,837	13,998
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	50,994	68,461
CASH AND CASH EQUIVALENTS AT END OF PERIOD	53,831	82,459
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	(57)	(2)
Cash paid for income taxes	(299)	(320)
Income tax refunds received	83	2
Non-cash additions to property, plant and equipment	$ 196	$ 40