CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Repayments of Long-term Debt	$ (321)	$ 0
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	41,135	(19,486)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	5,508	5,424
Amortization of acquired intangible assets	1,015	832
Share-based compensation expense	3,510	5,118
Provision for Doubtful Accounts	603	(341)
Gain (Loss) on Sale of Properties	(917)	0
Gain (Loss) on Disposition of Assets	101	52
Inventory Write-down	0	946
Restructuring Charges	13,858	0
Decrease (increase) in deferred income taxes	2	37
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	(35,271)	15,258
Decrease (increase) in inventories	(24,402)	(3,259)
Decrease (increase) in shipped systems pending acceptance	(67)	(2,802)
Decrease (increase) in other current assets	1,489	(738)
Increase (decrease) in accounts payable and accrued liabilities	36,963	(5,189)
Increase (decrease) in deferred revenue	(2,730)	4,449
Net cash (used in) provided by operating activities	40,797	301
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(48,668)	(331,343)
Proceeds from sales and maturities of investments	17,034	339,691
Purchase of property, plant and equipment	(3,116)	(3,408)
Decrease (increase) in other assets	(4,646)	(120)
Net cash (used in) provided by investing activities	(36,360)	2,817
Proceeds from Sale of Property, Plant, and Equipment	37	7
Proceeds from Divestiture of Businesses	2,999	0
Payments to Acquire Businesses, Net of Cash Acquired	0	2,010
CASH FLOWS FROM FINANCING ACTIVITIES
Payments Related to Tax Withholding for Share-based Compensation	(1,696)	(801)
Proceeds from Issuance of Common Stock	2,624	1,043
Net cash (used in) provided by financing activities	607	242
Effect of exchange rate changes on cash	562	(882)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	5,606	2,478
Cash and Cash Equivalents, at Carrying Value	62,251	44,891
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	63,338	44,891
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	496	30
Cash paid for income taxes	(979)	(504)
Income tax refunds received	67	45
Property, Plant and Equipment, Gross, Period Increase (Decrease)	(824)	5,414
Property, Plant and Equipment, Additions	$ 483	$ 205