CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Repayments of Long-term Debt	$ (212)	$ 0
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	7,162	(9,793)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	3,469	3,592
Amortization of acquired intangible assets	657	554
Share-based compensation expense	2,797	3,136
Provision for Doubtful Accounts	371	(235)
Gain (Loss) on Disposition of Assets	0	40
Inventory Write-down	0	1,170
Restructuring Charges	13,858	0
Decrease (increase) in deferred income taxes	(31)	87
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	(7,094)	13,373
Decrease (increase) in inventories	(7,874)	(3,669)
Decrease (increase) in shipped systems pending acceptance	(2,051)	(2,712)
Decrease (increase) in other current assets	970	(43)
Increase (decrease) in accounts payable and accrued liabilities	12,392	(6,100)
Increase (decrease) in deferred revenue	1,070	4,577
Net cash (used in) provided by operating activities	25,696	3,977
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(38,336)	(228,921)
Proceeds from sales and maturities of investments	10,861	240,209
Purchase of property, plant and equipment	(1,445)	(2,710)
Decrease (increase) in other assets	(4,503)	(71)
Net cash (used in) provided by investing activities	(33,386)	6,504
Proceeds from Sale of Property, Plant, and Equipment	37	7
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	(1,684)	(793)
Proceeds from Issuance of Common Stock	665	654
Net cash (used in) provided by financing activities	(1,231)	(139)
Effect of exchange rate changes on cash	260	(70)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(8,661)	10,272
Cash and Cash Equivalents, at Carrying Value	47,973
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	49,071	52,685
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	331	25
Cash paid for income taxes	(500)	(251)
Income tax refunds received	67	6
Property, Plant and Equipment, Gross, Period Increase (Decrease)	(2,052)	3,128
Property, Plant and Equipment, Additions	$ 112	$ 270