CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Oct. 01, 2016	Sep. 26, 2015
Payments to Acquire Businesses, Net of Cash Acquired	$ 2,010	$ 0
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	(9,793)	(9,624)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	3,592	3,803
Amortization of acquired intangible assets	554	725
Share-based compensation expense	3,136	2,626
Gain on sale of property and equipment, net	(40)	(6)
Provision for Doubtful Accounts	(235)	127
Charges for Asset write0off of damaged product	1,170	0
Decrease (increase) in deferred income taxes	87	106
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	13,373	(3,953)
Decrease (increase) in inventories	(3,669)	(2,668)
Decrease (increase) in shipped systems pending acceptance	(2,712)	17
Decrease (increase) in other current assets	(43)	2,736
Increase (decrease) in accounts payable and accrued liabilities	(6,100)	10,308
Increase (decrease) in deferred revenue	4,577	286
Net cash (used in) provided by operating activities	3,977	4,495
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(228,921)	(261,978)
Proceeds from sales and maturities of investments	240,209	251,982
Purchase of property, plant and equipment	(2,710)	(2,185)
Decrease (increase) in other assets	(71)	386
Net cash (used in) provided by investing activities	6,504	(11,795)
Proceeds from Sale of Property, Plant, and Equipment	7	0
CASH FLOWS FROM FINANCING ACTIVITIES
Payments Related to Tax Withholding for Share-based Compensation	(793)	(603)
Proceeds from Issuance of Common Stock	654	737
Net cash (used in) provided by financing activities	(139)	134
Effect of exchange rate changes on cash	(70)	(186)
NET CHANGE IN CASH AND CASH EQUIVALENTS	10,272	(7,352)
Cash and Cash Equivalents, at Carrying Value	52,685	43,642
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	25	57
Cash paid for income taxes	(251)	(478)
Income tax refunds received	6	110
Property, Plant and Equipment, Gross, Period Increase (Decrease)	3,128	622
Property, Plant and Equipment, Additions	$ 270	$ 227

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Amount of deferred income tax expense (benefit) and income tax credits.

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The increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The amount of cash received during the period as refunds for the overpayment of taxes.

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The cash inflow from the additional capital contribution to the entity.

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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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