CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Jul. 02, 2016	Jun. 27, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (118)	$ (6,364)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,710	1,900
Amortization of acquired intangible assets	279	357
Share-based compensation expense	1,462	1,387
Gain on sale of property and equipment, net	0	(3)
Provision for Doubtful Accounts	(115)	127
Charges for Asset write0off of damaged product	1,216	0
Decrease (increase) in deferred income taxes	15	(44)
Changes in operating accounts, net of acquisitions:
Decrease (increase) in trade receivables, net	8,463	(5,338)
Decrease (increase) in inventories	(2,313)	(552)
Decrease (increase) in shipped systems pending acceptance	(1,138)	389
Decrease (increase) in other current assets	141	961
Increase (decrease) in accounts payable and accrued liabilities	(593)	6,916
Increase (decrease) in deferred revenue	2,439	2,585
Net cash (used in) provided by operating activities	11,448	2,327
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments	(96,691)	(162,395)
Proceeds from sales and maturities of investments	107,148	164,346
Purchase of property, plant and equipment	(1,469)	(1,344)
Decrease (increase) in other assets	(9)	(138)
Net cash (used in) provided by investing activities	8,979	469
CASH FLOWS FROM FINANCING ACTIVITIES
Payments Related to Tax Withholding for Share-based Compensation	(730)	(531)
Proceeds from Issuance of Common Stock	332	401
Net cash (used in) provided by financing activities	(398)	(130)
Effect of exchange rate changes on cash	21	171
NET CHANGE IN CASH AND CASH EQUIVALENTS	20,050	2,837
Cash and Cash Equivalents, at Carrying Value	62,463	53,831
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	25	57
Cash paid for income taxes	(132)	(299)
Income tax refunds received	0	83
Property, Plant and Equipment, Gross, Period Increase (Decrease)	1,987	0
Property, Plant and Equipment, Additions	$ 1,050	$ 196

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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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- 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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Namespace Prefix:	us-gaap_
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

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
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

+ Details

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

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration