CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Dec. 31, 2016	Jan. 02, 2016
Payments to Acquire Businesses, Net of Cash Acquired	$ 2,010	$ 0
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	(19,486)	(14,210)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	5,424	5,659
Amortization of acquired intangible assets	832	1,047
Share-based compensation expense	5,118	3,939
Gain on sale of property and equipment, net	(52)	(788)
Provision for Doubtful Accounts	(341)	127
Charges for Asset write0off of damaged product	946	0
Decrease (increase) in deferred income taxes	37	(71)
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	15,258	8,593
Decrease (increase) in inventories	(3,259)	(7,046)
Decrease (increase) in shipped systems pending acceptance	(2,802)	1,342
Decrease (increase) in other current assets	(738)	1,967
Increase (decrease) in accounts payable and accrued liabilities	(5,189)	10,531
Increase (decrease) in deferred revenue	4,449	(4,668)
Net cash (used in) provided by operating activities	301	7,998
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(331,343)	(320,581)
Proceeds from sales and maturities of investments	339,691	306,423
Purchase of property, plant and equipment	(3,408)	(2,740)
Decrease (increase) in other assets	(120)	(133)
Net cash (used in) provided by investing activities	2,817	(17,029)
Proceeds from Sale of Property, Plant, and Equipment	7	2
CASH FLOWS FROM FINANCING ACTIVITIES
Payments Related to Tax Withholding for Share-based Compensation	(801)	(645)
Proceeds from Issuance of Common Stock	1,043	1,056
Net cash (used in) provided by financing activities	242	411
Effect of exchange rate changes on cash	(882)	(303)
NET CHANGE IN CASH AND CASH EQUIVALENTS	2,478	(8,923)
Cash and Cash Equivalents, at Carrying Value	44,891	42,071
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	30	57
Cash paid for income taxes	(504)	(799)
Income tax refunds received	45	140
Property, Plant and Equipment, Gross, Period Increase (Decrease)	5,414	2,988
Property, Plant and Equipment, Additions	$ 205	$ 160

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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 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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