Electro Scientific Industries (ESIO) 10-Q 6 Feb 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Dec. 30, 2017	Feb. 02, 2018
Document And Entity Information [Abstract]
Entity Common Stock, Shares Outstanding		33,552,089
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 30, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Registrant Name	ELECTRO SCIENTIFIC INDUSTRIES INC
Entity Central Index Key	726,514
Current Fiscal Year End Date	--03-31
Entity Well-know Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Current assets:
Cash and Cash Equivalents, at Carrying Value	$ 62,251	$ 56,642
Short-term investments	36,824	5,743
Accounts Receivable, Net, Current	75,674	40,494
Inventories	74,502	58,942
Shipped systems pending acceptance	5,780	5,713
Other current assets	5,116	6,180
Total current assets	260,147	173,714
Non-current assets:
Property, plant and equipment, net	19,732	21,619
Goodwill	2,626	3,027
Acquired intangible assets, net	5,525	6,564
Income Taxes Receivable, Noncurrent	935	0
Other assets	17,339	19,821
Total assets	306,304	224,745
Current liabilities:
Accounts payable	38,577	21,213
Accrued liabilities	40,391	22,186
Deferred revenue	11,982	14,712
Total current liabilities	90,950	58,111
Long-term Debt	12,875	13,489
Non-current liabilities:
Non-current income taxes payable	1,587	1,036
Liabilities, Other than Long-term Debt, Noncurrent	10,085	7,578
Liabilities	115,497	80,214
Commitments and Contingencies
Shareholders' equity:
Preferred stock, without par value	0	0
Common stock, without par value	211,330	207,152
Retained earnings	(20,273)	(61,407)
Accumulated other comprehensive income	(250)	(1,214)
Total shareholders' equity	190,807	144,531
Total liabilities and shareholders' equity	$ 306,304	$ 224,745

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 658	$ 603
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	81,728	112,075
Finite-Lived Intangible Assets, Accumulated Amortization	$ 23,035	$ 21,994
Preferred stock, without par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, without par value	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, issued	34,309,000	33,260,000
Common stock, outstanding	34,309,000	33,260,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Sales Revenue, Goods, Net	$ 99,418	$ 25,427	$ 221,827	$ 85,069
Sales Revenue, Services, Net	11,422	8,352	32,664	26,036
Net sales	110,840	33,779	254,491	111,105
Cost of Goods Sold	52,502	17,283	132,107	53,851
Cost of Services	5,182	5,048	16,276	14,018
Cost of sales	57,684	22,331	148,383	67,869
Gross profit	53,156	11,448	106,108	43,236
Operating expenses:
Selling, service and administration	11,040	13,280	35,496	38,917
Research, development and engineering	8,165	7,868	25,373	23,258
Business Combination, Integration Related Costs	0	31	0	366
Restructuring Costs	706	321	4,079	321
Net operating expenses	19,911	21,500	64,948	62,862
Operating (loss) income	33,245	(10,052)	41,160	(19,626)
Non-operating (expense) income:
Interest and other (expense) income, net	789	34	376	162
Other Nonoperating Income (Expense)	789	34	376	162
Income (loss) before income taxes	34,034	(10,018)	41,536	(19,464)
Provision for (benefit from) income taxes	61	(325)	401	22
Net (loss) income	$ 33,973	$ (9,693)	$ 41,135	$ (19,486)
Net (loss) income per share - basic	$ 0.99	$ (0.29)	$ 1.22	$ (0.60)
Net (loss) income per share - diluted	$ 0.94	$ (0.29)	$ 1.16	$ (0.60)
Weighted average number of shares - basic	34,224	32,919	33,839	32,379
Weighted average number of shares - diluted	36,010	32,919	35,562	32,379

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Net (loss) income	$ 33,973	$ (9,693)	$ 41,135	$ (19,486)
Foreign currency translation adjustment, net of taxes	581	(745)	969	(884)
Accumulated other comprehensive loss related to benefit plan obligations, net of taxes	4	5	13	14
Net unrealized (loss) gain on available-for-sale securities, net of taxes	(17)	(2)	(18)	(6)
Other Comprehensive Income (Loss), Net of Tax	568	(742)	964	(876)
Comprehensive (loss) income	$ 34,541	$ (10,435)	$ 42,099	$ (20,362)

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 31, 2016
Foreign currency translation adjustment, taxes	$ 8	$ 0	$ 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	(2)	(5)	(7)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEMEN

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

The Company

The Company	9 Months Ended
	Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	1. Basis of Presentation These unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with United States generally accepted accounting principles (U.S. GAAP) have been condensed or omitted in these interim statements. Accordingly, these condensed consolidated financial statements should be read in conjunction with the financial statements and notes included in the Annual Report of Electro Scientific Industries, Inc. (the Company) on Form 10-K for its fiscal year ended April 1, 2017 . These interim statements include all adjustments (consisting of only normal recurring adjustments and accruals) necessary for a fair presentation of results for the interim periods presented. The results for interim periods are not necessarily indicative of the results of operations for the entire year. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of commitments and contingencies at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results may differ from those estimates. Management believes that the estimates used are reasonable. Significant estimates made by management include: revenue recognition; valuation of inventory; accrued restructuring costs; share-based compensation; income taxes, including the valuation of deferred tax assets; valuation of long-lived assets, including intangibles; valuation of goodwill and acquisition accounting. There have been no significant changes to the Company's significant accounting policies from those presented in Note 2: Summary of Significant Accounting Policies to the consolidated financial statements included in the Company's Annual Report on Form 10-K for its fiscal year ended April 1, 2017 . All references to years or quarters relate to fiscal years or fiscal quarters unless otherwise noted. The fiscal quarters ended December 30, 2017 and December 31, 2016 each consisted of 13-week periods. Similarly, the three quarters ended December 30, 2017 and the three quarters ended December 31, 2016 each consisted of 39-week periods. Restricted Cash Cash and cash equivalents that are restricted as to withdrawal or use under the terms of certain long-term contractual agreements are recorded in Other non-current assets on our balance sheet. The following table provides a summary of the Company's cash, cash equivalents, and restricted cash position. (In thousands) Dec 30, 2017 Apr 1, 2017 Dec 31, 2016 Cash and cash equivalents $ 62,251 $ 56,642 $ 44,891 Restricted cash included in other long-term assets 1,087 1,090 — Total cash, cash equivalents and restricted cash $ 63,338 $ 57,732 $ 44,891

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Dec. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	2. Recent Accounting Pronouncements Adopted accounting pronouncements: In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-09, “Compensation – Stock Compensation – Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies the accounting for several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows, and the accounting for forfeitures. ASU 2016-09 was effective for the Company as of April 2, 2017, the beginning of fiscal 2018. Adopting ASU 2016-09 increased diluted weighted average shares outstanding by approximately 40 thousand shares in the first quarter of 2018 due to the change in recognition of excess tax benefits in the calculation. The ASU is expected to increase the volatility of the Company's diluted shares outstanding on a go-forward basis. In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory.” ASU 2015-11 simplifies the measurement of inventory by requiring companies to measure inventory at the lower of cost and net realizable value rather than measuring at the lower of cost of market where the market value was determined based off of three different measures. ASU 2015-11 was effective for the Company as of April 2, 2017, the beginning of fiscal 2018. Adopting ASU 2015-11 has not had a material effect on the Company's inventory valuation. Recently issued accounting pronouncements not yet adopted In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , in order to (i) improve disclosures related to an entity's risk management activities through better transparency and understandability and (ii) simplify and reduce the complexity of hedge accounting by preparers. ASU 2017-12 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods, which would be the Company's fiscal year ending March 28, 2020. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not yet been issued. While the Company does not expect the adoption of ASU 2017-12 to have a material effect on its business, the Company is still evaluating any potential impact that adoption of ASU 2017-12 may have on its financial position, results of operations or cash flows. In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting , which amends the scope of modification accounting surrounding share-based payment arrangements as issued in ASU 2016-09 by providing guidance on the various types of changes which would trigger modification accounting for share-based payment awards, specifically an entity would not apply modification accounting under ASC 718 if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. ASU 2017-09 is effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods, which would be the Company's fiscal year ending March 30, 2019. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not yet been issued. The adoption of ASU 2017-09 will not have a material effect on the Company's financial position, results of operations or cash flows. In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which requires companies to disaggregate the current-service-cost component from other components of net benefit cost and provides specific guidance for presentation in the income statement. ASU 2017-07 is effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods, which would be the Company's fiscal year ending March 30, 2019. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The adoption of ASU 2017-07 will not have a material effect on the Company's financial position, results of operations or cash flows. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers: Topic 606 (ASU 2014-09) , to supersede nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date , which deferred the effective date for implementation of ASU 2014-09 by one year, making the new guidance effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted no earlier than the original effective date. The FASB has continued to issue ASU topics to further clarify ASU 2014-09. These have included ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20. The effective date and transition requirements of these ASU topics are the same as the effective date and transition requirements of ASU 2015-14. The new standards are effective for the Company's fiscal year ending March 30, 2019, beginning with the first quarter of that fiscal year. The new standard permits adoption by using either (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The Company plans to elect the modified retrospective approach as its transition method. The Company developed an implementation plan and assigned cross-functional internal resources to perform a comprehensive assessment of the new standard and its impact on the financial statements of the Company. This assessment is ongoing and includes identification, consideration, and quantification of the impact of the new standard on the Company's financial statements, accounting policies, processes, control environment and systems. The outcome of this evaluation will be the implementation of supporting processes and systems that enable timely and accurate reporting under the new standard. While the Company continues to assess all potential impacts under the new standard, we believe that based on a preliminary assessment the new standard is unlikely to result in a significant change to the amount or timing of revenue recognition related to system sales or service contracts, the Company's major revenue streams. There may be some impact related to the allocation of value and timing of recognition in situations where service contracts, which the Company expects to be recognized over time, are sold together with systems that are primarily recognized at a point in time. The Company believes that certain aspects of the new guidance will require significant judgment, including identification of relevant performance obligations and quantification and allocation of the consideration to which the entity expects to be entitled in exchange for those goods or services. Further, in connection with the adoption of the standard, there is a requirement to capitalize certain costs, which for the Company primarily comprises commission expenses for sales representatives. Any such costs required to be capitalized would amortize over the period of performance for the underlying contracts. The Company is still evaluating the impact of capitalizing costs to execute a contract. However, the primary potential impact is expected to relate to commissions on service contracts with a duration approximating or exceeding one year. The impact related to contracts with a duration over one year is not expected to be significant and the Company expects to elect the practical expedient under the new standard for costs with a duration less than one year and expense those items as incurred. This preliminary assessment is based on the Company's analysis of actual historical revenue transactions and current customer contracts under the new guidance and presumes certain conclusions as it relates to accounting policies under the new standard and the Company's current contracts. Due to the complexity of certain of the Company's contracts and at least the possibility that contractual arrangements could change, the actual revenue recognition treatment required under the new standard for these arrangements may be dependent on contract-specific terms and may vary from this overall expectation. The Company currently expects that necessary operational changes will be implemented prior to the adoption date. The new standard will increase the Company's revenue related disclosures; primarily by expanding disclosure of the Company's policies, significant estimates, and performance obligations. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory , to improve and simplify the accounting for the income tax consequences of intra-entity transfers of assets other than inventory, requiring companies to recognize income tax consequences upon the transfer of the asset to a third party. ASU 2016-16 is effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods, which would be the Company's fiscal year ending March 30, 2019. While the Company does not expect the adoption of ASU 2016-16 to have a material effect on its business, the Company is still evaluating any potential impact that adoption of ASU 2016-16 may have on its financial position, results of operations or cash flows. In February 2016, the FASB issued ASU 2016-02, Leases . ASU 2016-02 increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and requires disclosing key information about leasing arrangements. ASU 2016-02 is effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods, which would be the Company's fiscal year ending March 28, 2020. The Company is still evaluating any potential impact that adoption of ASU 2016-02 may have on its financial position, results of operations or cash flows.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Dec. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value ASC Topic 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include the following: • Level 1 , defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; • Level 2 , defined as inputs that are observable either directly or indirectly such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and other inputs that can be corroborated by observable market data; and • Level 3 , defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 30, 2017 and April 1, 2017 was as follows (in thousands): December 30, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market securities $ 24,537 $ — $ — $ 24,537 Commercial paper — 4,149 — 4,149 Total cash equivalents $ 24,537 $ 4,149 $ — $ 28,686 Short term investments - available for sale: U.S. treasury fund $ 10,447 $ — $ — $ 10,447 Commercial paper — 24,173 — 24,173 Corporate bonds — 2,204 — 2,204 Total short-term investments - available for sale $ 10,447 $ 26,377 $ — $ 36,824 Forward purchase or (sale) contracts: Japanese Yen $ — $ (1 ) $ — $ (1 ) New Taiwan Dollar — 11 — 11 Korean Won — (4 ) — (4 ) Euro — (14 ) — (14 ) British Pound — (13 ) — (13 ) Chinese Renminbi — (51 ) — (51 ) Total forward contracts $ — $ (72 ) $ — $ (72 ) Deferred compensation plan assets:* Mutual funds and exchange traded funds $ 2,634 $ — $ — $ 2,634 Money market securities 959 — — 959 Total deferred compensation plan assets $ 3,593 $ — $ — $ 3,593 April 1, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market securities $ 22,395 $ — $ — $ 22,395 Commercial paper — 4,945 — 4,945 Total cash equivalents $ 22,395 $ 4,945 $ — $ 27,340 Short term investments - available for sale: Commercial paper $ — $ 5,743 $ — $ 5,743 Total short-term investments - available for sale $ — $ 5,743 $ — $ 5,743 Forward purchase or (sale) contracts: Japanese Yen $ — $ 9 $ — $ 9 New Taiwan Dollar — 20 — 20 Korean Won — 39 — 39 Euro — (96 ) — (96 ) British Pound — 16 — 16 Chinese Renminbi — (5 ) — (5 ) Singapore Dollar — (1 ) — (1 ) Total forward contracts $ — $ (18 ) $ — $ (18 ) Deferred compensation plan assets:* Mutual funds and exchange traded funds $ 845 $ — $ — $ 845 Money market securities 2,213 — — 2,213 Total deferred compensation plan assets $ 3,058 $ — $ — $ 3,058 *These investments represent assets held in trust for the deferred compensation plan For Level 1 assets, the Company utilized quoted prices in active markets for identical assets. For Level 2 assets, exclusive of forward contracts, the Company utilized quoted prices in active markets for similar assets. For forward contracts, spot prices at December 30, 2017 and April 1, 2017 were utilized to calculate fair values. During the first three quarters of 2018 and 2017 , there were no transfers between Level 1, 2 or 3 assets. Investments The Company’s investments, other than money market securities for which there is no unrealized gain or loss, at December 30, 2017 and April 1, 2017 were as follows (in thousands): Unrealized December 30, 2017 Cost Gain Loss Fair Value Available-for-sale securities (current): U.S. treasury fund $ 10,465 $ — $ (18 ) $ 10,447 Commercial paper 28,322 — — 28,322 Corporate Bonds 2,205 — (1 ) 2,204 Total investments (current) $ 40,992 $ — $ (19 ) $ 40,973 Available-for-sale securities (non-current): Mutual funds, exchange traded funds and money market securities* $ 3,322 $ 271 $ — $ 3,593 Total investments (non-current) $ 3,322 $ 271 $ — $ 3,593 Unrealized April 1, 2017 Cost Gain Loss Fair Value Available-for-sale securities (current): Commercial paper $ 10,688 $ — $ — $ 10,688 Total investments (current) $ 10,688 $ — $ — $ 10,688 Available-for-sale securities (non-current): Mutual funds, exchange traded funds and money market securities* $ 2,974 $ 84 $ — $ 3,058 Total investments (non-current) $ 2,974 $ 84 $ — $ 3,058 *These investments represent assets held in trust for the deferred compensation plan For purposes of determining gross realized gains and losses and reclassification out of accumulated other comprehensive income (loss), the cost of securities sold is based on specific identification. Net unrealized holding gains and losses on current available-for-sale securities included in accumulated other comprehensive income (loss) were insignificant as of December 30, 2017 and April 1, 2017 .

Inventories

Inventories	9 Months Ended
	Dec. 30, 2017
Inventory Disclosure [Abstract]
Inventories	5. Inventories Inventories are principally valued at standard cost, which approximates the lower of cost or net realizable value on a first-in, first-out basis. Components of inventories were as follows: (In thousands) Dec 30, 2017 Apr 1, 2017 Raw materials and purchased parts $ 50,720 $ 41,383 Work-in-process 18,737 13,829 Finished goods 5,045 3,730 $ 74,502 $ 58,942

Other Assets

Other Assets	9 Months Ended
	Dec. 30, 2017
Other Assets, Noncurrent Disclosure [Abstract]
Other Assets	6. Other Assets Other assets consisted of the following: (In thousands) Dec 30, 2017 Apr 1, 2017 Demo and leased equipment, net $ 8,636 $ 11,011 Long term deposits and non-trade receivables 2,620 2,872 Non-current restricted cash 1,087 1,090 Non-current deferred income taxes, net 827 890 Other non-current assets 4,169 3,958 $ 17,339 $ 19,821 Depreciation expense for demo and leased equipment totaled $0.6 million in the third quarter of 2018 and $0.1 million in the third quarter of 2017 . For the three fiscal quarters ended December 30, 2017 depreciation expense for demo and leased equipment totaled $0.8 million compared to $0.3 million for the three fiscal quarters ended December 31, 2016 . Of the total $8.6 million and $11.0 million of demo and leased equipment at December 30, 2017 and April 1, 2017 , $4.1 million and $1.1 million were leased assets at customer sites generating revenue. Included in Other non-current assets are long-term investments held in a trust for the deferred compensation plan, non-current trade accounts receivable and other items.

Accrued Liabilities (Current) O

Accrued Liabilities (Current) Other liabilities (Notes)	9 Months Ended
	Dec. 30, 2017
Other Liabilities Disclosure [Abstract]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	7. Accrued Liabilities Accrued liabilities consisted of the following: (In thousands) Dec 30, 2017 Apr 1, 2017 Payroll-related liabilities $ 12,841 $ 6,335 Customer deposits 11,431 1,242 Product warranty accrual 4,506 3,394 Purchase order commitments and receipts 3,014 2,522 Restructuring costs payable 2,608 4,996 Professional fees payable 832 734 Current portion, long-term debt 415 434 Other current liabilities 4,744 2,529 $ 40,391 $ 22,186 Included in other current liabilities above are accrued amounts for value-added taxes, income taxes, freight, and other similar items.

Product Warranty

Product Warranty	9 Months Ended
	Dec. 30, 2017
Product Warranties Disclosures [Abstract]
Product Warranty	8. Product Warranty The following is a reconciliation of the changes in the aggregate product warranty accrual: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Product warranty accrual, beginning $ 7,156 $ 5,521 $ 5,474 $ 5,734 Warranty charges incurred, net (3,273 ) (1,674 ) (8,384 ) (4,988 ) Provision for warranty charges 5,067 1,064 11,860 4,165 Product warranty accrual, ending $ 8,950 $ 4,911 $ 8,950 $ 4,911 Net warranty charges incurred include labor charges and costs of replacement parts for system repairs under warranty. These costs are recorded net of any estimated cost recoveries resulting from either successful repair of damaged parts or from warranties offered by the Company’s suppliers for defective components. The provision for warranty charges reflects the estimate of future anticipated net warranty costs to be incurred for all products under warranty at quarter end and is recorded to cost of sales. Of the total of $9.0 million and $4.9 million of product warranty accruals as of December 30, 2017 and December 31, 2016 , $4.5 million and $0.8 million were non-current and were included in Other liabilities on the Condensed Consolidated Balance Sheets.

Deferred Revenue

Deferred Revenue	9 Months Ended
	Dec. 30, 2017
Deferred Revenue Disclosure [Abstract]
Deferred Revenue	9. Deferred Revenue Generally, revenue is recognized upon fulfillment of acceptance criteria at the Company's factory and transfer of risk of loss and title. Revenue is deferred whenever title transfer is pending, risk of loss has not transferred, and/or acceptance criteria have not yet been fulfilled. Deferred revenue arises from, among other factors, sales to Japanese customers, shipments of substantially new products and shipments with custom specifications and other acceptance criteria where the Company cannot demonstrate a track record of acceptance. For sales involving multiple element arrangements, the relative selling price of any undelivered elements, including installation services and similar items, is deferred until the elements are delivered and acceptance criteria are met. Revenue related to maintenance and service contracts is deferred and recognized ratably over the duration of the contracts. The following is a reconciliation of the changes in deferred revenue: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Deferred revenue, beginning $ 15,616 $ 11,583 $ 15,397 $ 7,685 Revenue deferred 51,191 9,075 66,661 28,547 Revenue recognized (54,420 ) (9,440 ) (69,671 ) (25,014 ) Deferred revenue, ending $ 12,387 $ 11,218 $ 12,387 $ 11,218 Of the total of $12.4 million and $11.2 million of deferred revenue at December 30, 2017 and December 31, 2016 , $0.4 million and $0.4 million were non-current and were included in Other liabilities on the Condensed Consolidated Balance Sheets.

Long-term Debt (Notes)

Long-term Debt (Notes)	9 Months Ended
	Dec. 30, 2017
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	10. Long-term Debt On January 9, 2017, ESI Leasing, LLC (ESI Leasing), a wholly owned subsidiary of the Company, entered into a loan agreement (Loan Agreement) with First Technology Federal Credit Union (Lender). The Loan Agreement provides for a term loan from the Lender to ESI Leasing in the principal amount of $14 million (Loan). The interest rate of the Loan is fixed at 4.75% per annum, except that it may be increased if certain covenants under the Loan Agreement are not satisfied and after and during the continuation of an “Event of Default” as defined in the Loan Agreement. The Loan amortizes over a period of approximately 20 years, with the outstanding principal maturing and becoming due on January 1, 2027. ESI Leasing pays monthly principal and interest payments on the Loan totaling $1.1 million annually through the maturity of the Loan. The Company unconditionally guarantees the Loan. The Company is required to maintain certain deposits with the Lender through March 31, 2019, at which point the restriction will be removed as long as we are in compliance with certain minimum covenants. The principal maturities for each of the upcoming calendar twelve-month periods ending on December 30 are as follows: (In thousands) 2018 2019 2020 2021 2022 Principal maturities $ 449 $ 471 $ 492 $ 518 $ 543 Total debt outstanding on the Loan Agreement were as follows: (In thousands) Dec 30, 2017 Apr 1, 2017 Total debt outstanding $ 13,290 $ 13,923 Less: Current portion, long-term debt (415 ) (434 ) Long-term debt $ 12,875 $ 13,489 Deferred debt issuance costs related to the above long-term debt as of December 30, 2017 and April 1, 2017 were $311 thousand and $337 thousand , respectively.

Revolving Credit Facility (Note

Revolving Credit Facility (Notes)	9 Months Ended
	Dec. 30, 2017
Debt Disclosure [Abstract]
Revolving Credit Facility [Text Block]	11. Revolving Credit Facility The Company is party to a loan and security agreement (Credit Facility) with Silicon Valley Bank (SVB), which was initially entered into on March 20, 2015 and amended on July 12, 2016. The Credit Facility provides for a senior secured asset-based revolving facility with availability up to $30.0 million, including a $15.0 million sublimit for letters of credit. In the fourth quarter of fiscal 2017, the Company amended and extended the Credit Facility by one year. With this extension, the Credit Facility expires March 20, 2019. At December 30, 2017 , the Company had no amounts outstanding under the Credit Facility, was in compliance with all covenants, and was not in default under the Credit Facility. The commitment fee on the amount of unused credit was 0.3 percent. As amended, the Credit Facility allows for a greater level of EBITDA losses, but reduces the level of permitted acquisitions and purchases of capital equipment. If the Company fails to meet the covenants in its Credit Facility or its lenders fail to fund, access to the facility may be limited or the facility may become unavailable altogether.

Commitments & Contingencies (No

Commitments & Contingencies (Notes)	9 Months Ended
	Dec. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	12. Commitments & Contingencies The Company mitigates credit risk by transacting with highly rated counterparties for foreign exchange contracts, letters of credit and other transactions where counterparty risk is a factor. The Company has evaluated the non-performance risks associated with the Company's lenders and other parties and believes them to be insignificant. From time to time the Company may be party to litigation arising in the normal course of business. Currently, the Company is not party to any litigation it believes would have a material adverse effect on the Company's financial position, results of operations or cash flows.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Dec. 30, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	13. Shareholders’ Equity Share Repurchase Program In December 2011, the Board of Directors authorized a share repurchase program totaling $20.0 million to acquire shares of the Company's outstanding common stock. The repurchases are to be made at management’s discretion in the open market or in privately negotiated transactions in compliance with applicable securities laws and other legal requirements and are subject to market conditions, acceptable share price and other factors. The Company did not repurchase any shares during fiscal 2017 or the first three quarters of 2018 . There is no expiration date for the repurchase program.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Notes)	9 Months Ended
	Dec. 30, 2017
Accumulated Other Comprehensive Income [Abstract]
Comprehensive Income (Loss) Note [Text Block]	14. Accumulated Other Comprehensive Income (Loss) The following is a reconciliation of the changes in accumulated other comprehensive income (AOCI): Foreign currency translation adjustment Accumulated other comprehensive income related to benefit plan obligation Net unrealized loss on available-for-sale securities Total Balance at April 1, 2017 $ (1,242 ) $ 45 $ (17 ) $ (1,214 ) Other comprehensive income (loss) before reclassifications and taxes 961 20 (18 ) 963 Amounts reclassified from AOCI — — — — Tax effect 8 (7 ) — 1 Other Comprehensive income (loss) 969 13 (18 ) 964 Balance at December 30, 2017 $ (273 ) $ 58 $ (35 ) $ (250 )

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	15. Share-Based Compensation The Company's share-based compensation consists of stock-settled stock appreciation rights (SARs), restricted stock unit awards with a service condition (time-based RSUs), restricted stock unit awards with a performance condition (performance-based RSUs), restricted stock unit awards with a market performance condition (market-based RSUs) and an employee stock purchase plan. The Company recognizes expense related to the fair value of SARs and the 1990 Employee Stock Purchase Plan (ESPP) using the Black-Scholes model to estimate the fair value of awards on the date of grant. The fair value of time-based and performance-based restricted stock units (RSUs) are measured on the grant date based on the market value of the Company's common stock. The market-based RSUs must achieve the total shareholder return (TSR) measures in order for the awards to vest, and the grant date fair value of the awards is calculated using a Monte Carlo simulation model. Except for performance-based RSUs, the Company recognizes compensation expense for all share-based compensation awards, net of estimated forfeitures, on a straight-line basis over the requisite service period of the award. Expense for performance-based RSUs is recognized based on the probability of achievement of the performance criteria. The compensation cost for market-based RSUs is recognized over the related service period, even if the market condition is never satisfied. The impact of adjustments related to awards where the requisite service period was not completed is reflected as an offset to current period shared-based compensation expense. The Company granted a total of 442,400 time-based RSUs and 222,400 market-based RSUs during the first three quarters of 2018 , but did not grant any SARs or performance-based RSUs. Grants for the third quarter of 2018 consisted of 46,000 time-based RSUs and 25,000 market-based RSUs. Share-based compensation expense under the stock incentive plans is included in the Company’s Condensed Consolidated Statements of Operations as follows: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Cost of sales $ 64 $ 142 $ 208 $ 398 Selling, general and administrative 498 1,391 2,629 3,573 Research, development and engineering 151 285 484 656 Total share-based compensation expense $ 713 $ 1,818 $ 3,321 $ 4,627 The Company does not have any capitalizable share-based compensation costs for the three fiscal quarters ended December 30, 2017 and December 31, 2016 , respectively. As of December 30, 2017 , the Company had $8.0 million of total unrecognized share-based compensation costs, net of estimated forfeitures, which are expected to be recognized over a weighted average period of 2.3 years.

Product and Geographic Informat

Product and Geographic Information (Notes)	9 Months Ended
	Dec. 30, 2017
Product ang Geographic Information Reporting [Abstract]
Product and Geographic Information [Text Block]	16. Product and Geographic Information Operating segments are defined as components of an enterprise about which separate financial information is available and evaluated regularly by the chief operating decision maker (CODM) in deciding how to allocate resources and in assessing performance. The Company's CODM is its Chief Executive Officer (CEO). The Company and its consolidated subsidiaries operate in a single segment, defined as a manufacturer of high-technology microfabrication and related equipment. This segment sells products into a variety of end markets that are grouped into four major categories for the purpose of providing an understanding of the principal end markets for the products manufactured by the Company, specifically: 1) Printed Circuit Board (PCB), 2) Component Test, 3) Semiconductor, and 4) Industrial Machining. The following table presents net sales information by the four major market categories addressed by the Company's single segment: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Printed Circuit Board $ 83,799 $ 15,987 $ 179,658 $ 60,432 Component Test 7,473 5,407 23,331 14,999 Semiconductor 12,351 6,690 31,116 21,521 Industrial Machining 7,217 5,695 20,386 14,153 Net Sales $ 110,840 $ 33,779 $ 254,491 $ 111,105 Net sales by geographic area, based on the location of the end user, were as follows: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Asia $ 103,069 $ 26,015 $ 233,685 $ 92,184 Americas 2,431 6,210 9,537 11,464 Europe 5,340 1,554 11,269 7,457 Net Sales $ 110,840 $ 33,779 $ 254,491 $ 111,105

Restructuring and Cost Manageme

Restructuring and Cost Management Plans	9 Months Ended
	Dec. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring and Cost Management Plans	17. Restructuring and Cost Management Plans 2017 Corporate Restructuring: In the fourth quarter of 2017, the Company initiated a restructuring plan to improve business effectiveness and streamline operations to achieve a stated target profit level for the Company as a whole. As a part of the restructuring plan, the management team was reorganized from a business unit to a functional structure; the Company closed facilities in Montreal, Canada; Napa, California; and Sunnyvale, California; the Company discontinued certain products; and the Company made select reductions in headcount across the Company. Actions under this plan were completed as of the end of the third fiscal quarter of 2018. Total expenses related to the plan were $17.2 million in the first three quarters of 2018 and $7.6 million in the fourth quarter of 2017 . Included in the 2018 expenses are approximately $13.3 million of charges, all incurred in the first and second quarters of 2018, impacting gross margins primarily related to impairment of other assets and inventory stemming from the product portfolio program reviews. Operating expense charges included $2.5 million of facilities and fixed assets charges related to streamlining facilities and discontinued products and $1.3 million of employee severance and related costs. Restructuring costs of $0.7 million incurred in the third quarter of 2018 were primarily related to the employee severance and related costs to a departed executive. Product portfolio reviews are complete as of the end of third quarter of 2018. The impacts of the decisions made in the portfolio reviews involve the use of certain estimates. Actual results could differ from those estimates and result in additional charges. The following table presents the total expected restructuring costs as of December 30, 2017 (in thousands): Total Expected Costs for the Plan Costs Recognized from inception of the plan through the Quarter ended Dec 30, 2017 Remaining Costs to be Recognized Subsequent to Dec 30, 2017 Employee severance and related personnel costs $ 4,872 $ 4,872 $ — Site closure costs 1,714 1,714 — Current asset impairments and other gross profit charges (1) 14,947 14,947 — Non-current asset impairments 3,032 3,032 — Other costs 239 239 — Total $ 24,804 $ 24,804 $ — (1) Current asset impairments include inventory charges recorded in cost of sales. The following table presents the amounts payable related to the 2017 Corporate Restructuring (in thousands): Employee severance and related personnel costs Site closure costs Current asset impairments and other gross profit charges (1) Non-current asset impairments Other Costs Total Balance as of April 2, 2016 $ — $ — $ — $ — $ — $ — Costs incurred 3,588 888 1,669 1,376 66 7,587 Cash payments (341 ) — — — (66 ) (407 ) Non-cash items — — (1,669 ) (1,376 ) — (3,045 ) Balance as of April 1, 2017 $ 3,247 $ 888 $ — $ — $ — $ 4,135 Costs incurred 1,284 824 13,278 1,657 175 17,218 Cash (payments) receipts (3,788 ) (1,389 ) (1,750 ) 32 (175 ) (7,070 ) Non-cash items — — (10,876 ) (1,689 ) — (12,565 ) Balance as of December 30, 2017 $ 743 $ 323 $ 652 $ — $ — $ 1,718 (1) Asset and facilities costs include inventory charges recorded in cost of sales. Other restructuring plans: The Company's previously disclosed restructuring plans are largely complete. Net restructuring costs related to these plans were $0.4 million in 2018 and $0.4 million in 2017 . Please see Note 26: Restructuring and Cost Management Plans to the Company’s financial statements included in its Annual Report on Form 10-K for the fiscal year ending April 1, 2017. The amounts payable of $0.9 million at December 30, 2017 are expected to be future cash outflows, primarily relating to facility costs to be paid through the end of calendar 2018. The Company does not expect to incur additional expenses related to these plans. The following table presents the amounts related to restructuring costs payable (in thousands): Restructuring & cost management amounts payable as of April 2, 2016 $ 757 Cash payments and other adjustments (297 ) Costs incurred 401 Restructuring & cost management amounts payable as of April 1, 2017 861 Cash payments and other adjustments (380 ) Costs incurred 409 Restructuring & cost management amounts payable as of December 30, 2017 $ 890 Overall restructuring reserve: As of December 30, 2017 , and April 1, 2017, the amount of unpaid restructuring costs included in accrued liabilities on the Consolidated Balance Sheets were $2.6 million and $5.0 million , respectively. Included in the payable balance are amounts for severance and employee benefits, asset retirement obligation and net lease commitments.

(Loss) Earnings Per Share

(Loss) Earnings Per Share	9 Months Ended
	Dec. 30, 2017
Earnings Per Share [Abstract]
(Loss) Earnings Per Share	19. Earnings (Loss) Per Share The following is a reconciliation of weighted average shares outstanding used in the calculation of basic and diluted earnings (loss) per share: Fiscal quarter ended Three fiscal quarters ended (In thousands, except per share data) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Net income (loss) $ 33,973 $ (9,693 ) $ 41,135 $ (19,486 ) Weighted average shares used for basic earnings per share 34,224 32,919 33,839 32,379 Incremental diluted shares 1,786 — 1,723 — Weighted average shares used for diluted earnings per share 36,010 32,919 35,562 32,379 Net income (loss) per share: Basic $ 0.99 $ (0.29 ) $ 1.22 $ (0.60 ) Diluted $ 0.94 $ (0.29 ) $ 1.16 $ (0.60 ) Awards of options, SARs and RSUs representing an additional 0.1 million and 2.8 million shares of stock for the third quarter of 2018 and 2017 , respectively, and 0.4 million and 2.5 million shares of stock for the first three quarters of 2018 and 2017 , respectively, were not included in the calculation of diluted net earnings per share because their effect would have been antidilutive.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Dec. 30, 2017
Business Combinations [Abstract]
Business Acquisitions	20. Business Acquisitions Fiscal 2017 On August 1, 2016, the Company acquired all of the outstanding shares of Visicon Technologies, Inc. (Visicon), a leading supplier of high-accuracy and high-throughput measurement and defect detection systems based in Napa, California. The consideration under the merger agreement is subject to adjustment for indebtedness, seller's transaction expenses, working capital and other items. Based on closing working capital levels and other adjustments, the Company paid $2.0 million in cash and issued 603,939 shares of ESI common stock, valued at approximately $4.2 million . The value of the common stock was based on the closing price of stock on August 1, 2016. A portion of the shares issued in connection with the agreement were reserved in escrow to serve as a source of payment for any purchase price adjustments or indemnity claims by the Company. The sellers have contractually agreed to limitations on the sale of the shares of common stock they received in connection with the sale of Visicon; specifically, no shares could be sold for six months following closing, after which twenty-five percent of the shares become salable each quarter thereafter. The shares issued as a part of this merger represented a non-cash investing activity of $4.2 million . The Company finalized the valuation of assets acquired, liabilities assumed, and consideration in the first quarter of 2018. The amounts shown below represent the fair value of the associated assets acquired, liabilities assumed and consideration transferred as of the acquisition date. The total estimated purchase price of $6.2 million , net of cash acquired, was allocated to the underlying assets acquired and liabilities assumed based on estimated fair value, as shown in the following table: (In thousands) Accounts receivable $ 391 Inventory 982 Prepaid expense and other current assets 116 Property, plant and equipment 737 Acquired intangibles 3,300 Goodwill 2,626 Other assets 26 Accounts payable and other accrued liabilities (1,952 ) Total purchase price, net of cash acquired $ 6,226 The acquisition provided the Company with a portfolio of standalone defect detection systems for the medical device and consumer electronics markets. In addition to a standalone product portfolio and associated value streams, the acquisition provided complementary technology for integrated verification of laser machining, to allow the Company to expand its presence into the medical device market, present an opportunity for enhanced vertical integration and result in synergies with the Company's current consumer electronics customer base. None of the goodwill is deductible for tax purposes. The acquired intangible assets consisted primarily of approximately $2.1 million of developed technology. Identified intangible assets are expected to be amortized over their useful lives of one to six years. The operating results of the acquired entity are included in the Company’s results of operations since the date of acquisition. Pro forma financial information has not been provided for the acquisition of Visicon as it is not material to the Company’s operations and financial position. Fiscal 2015 The Company acquired all of the outstanding shares of Wuhan Topwin Optoelectronics Technology Co., Ltd. (Topwin), a Chinese manufacturer of laser-based systems. In connection with this acquisition, the Company issued 145,442 shares and treated that as compensation to an employee of the Company who was previously an owner of Topwin. The compensation expense was recognized over the service period and from acquisition through the third quarter of fiscal 2018 , the Company has recognized $1.7 million in share-based compensation expense related to this acquisition. Share-based compensation expense recognized in 2018 was $0.2 million, all incurred in the first quarter.

Income Taxes (Notes)

Income Taxes (Notes)	9 Months Ended
	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	18. Income Taxes The Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law in the U.S. on December 22, 2017. The Tax Act includes various changes to the tax law, including a permanent reduction in the corporate income tax rate. The Company recognized the estimated effects of the changes in the tax rate and laws resulting from the Tax Act during the quarter ended December 31, 2017. The Tax Act reduces the federal corporate income tax rate from 35% to 21% effective January 1, 2018. The Company’s federal statutory rate for the fiscal year ending March 31, 2018 is a blended rate based on the weighting of pre- and post-Tax Act rates and will be 21% for future fiscal years. Deferred tax assets and liabilities are remeasured at the new rates; however, given a full valuation allowance against net deferred tax assets, the expense arising from the re-measurement of deferred tax assets and liabilities is fully offset by an equivalent adjustment to our existing valuation allowance, resulting in no net impact to tax expense. The Tax Act imposes a one-time transition tax on the deemed repatriation of post-1986 undistributed foreign subsidiaries’ earnings. Based on the information available as of December 31, 2017, the Company estimated undistributed foreign earnings of approximately $43 million. The taxable income arising from this deemed repatriation is expected to be fully offset by the utilization of net operating loss carryforwards and other tax credits, offset by changes in the valuation allowance, resulting in no net impact to tax expense. The Tax Act also includes a base erosion and anti-abuse tax (BEAT), applicable to corporations with annual gross receipts of at least $500M for the prior 3-years, which requires U.S. multinationals making “excessive” deductible payments to their foreign affiliates to pay a 10 percent tax on their income without those deductions, after a one-year, 5 percent transition rate. Further the Tax Act imposes a tax on global intangible low-taxed income (GILTI) on controlled foreign corporations’ aggregate net income over a 10% benchmark return on qualified business asset investment less interest expense. We have not evaluated the impacts of these provisions at this time nor have we elected whether to treat the impacts of GILTI as a period expense or as a deferred tax item. We continue to evaluate the impact the new legislation will have on our financial position, results of operations, and cash flows. We expect additional technical guidance from the Department of Treasury, possibly up through the date of the Company’s tax return filings. Additionally, the FASB has proposed new accounting guidance regarding the treatment of the impact of the Tax Act on items recorded within accumulated other comprehensive income (loss), but this guidance has not been finalized. The Securities and Exchange Commission Staff Accounting Bulletin No. 118 allows the use of provisional amounts if accounting for the income tax effects of the Act has not been completed when the Company’s financial statements are issued. This measurement period may extend no longer than one year. While we believe the net impact on the 2018 effective tax rate and tax expense is not material due to our existing net operating loss carryforwards and other tax credits, rule-making and the Company’s assessment remains ongoing. Therefore, the final impact of the Tax Reform may differ due to changes in interpretations, assumptions and that we are not able to fully quantify the impact on our financial position, results of operations, and cash flows at this time. Provisional amounts will be adjusted during the measurement period as accounting for the income tax effects of the Act is completed and the rules and technical guidance are finalized.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Dec. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis	The Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 30, 2017 and April 1, 2017 was as follows (in thousands): December 30, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market securities $ 24,537 $ — $ — $ 24,537 Commercial paper — 4,149 — 4,149 Total cash equivalents $ 24,537 $ 4,149 $ — $ 28,686 Short term investments - available for sale: U.S. treasury fund $ 10,447 $ — $ — $ 10,447 Commercial paper — 24,173 — 24,173 Corporate bonds — 2,204 — 2,204 Total short-term investments - available for sale $ 10,447 $ 26,377 $ — $ 36,824 Forward purchase or (sale) contracts: Japanese Yen $ — $ (1 ) $ — $ (1 ) New Taiwan Dollar — 11 — 11 Korean Won — (4 ) — (4 ) Euro — (14 ) — (14 ) British Pound — (13 ) — (13 ) Chinese Renminbi — (51 ) — (51 ) Total forward contracts $ — $ (72 ) $ — $ (72 ) Deferred compensation plan assets:* Mutual funds and exchange traded funds $ 2,634 $ — $ — $ 2,634 Money market securities 959 — — 959 Total deferred compensation plan assets $ 3,593 $ — $ — $ 3,593 April 1, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market securities $ 22,395 $ — $ — $ 22,395 Commercial paper — 4,945 — 4,945 Total cash equivalents $ 22,395 $ 4,945 $ — $ 27,340 Short term investments - available for sale: Commercial paper $ — $ 5,743 $ — $ 5,743 Total short-term investments - available for sale $ — $ 5,743 $ — $ 5,743 Forward purchase or (sale) contracts: Japanese Yen $ — $ 9 $ — $ 9 New Taiwan Dollar — 20 — 20 Korean Won — 39 — 39 Euro — (96 ) — (96 ) British Pound — 16 — 16 Chinese Renminbi — (5 ) — (5 ) Singapore Dollar — (1 ) — (1 ) Total forward contracts $ — $ (18 ) $ — $ (18 ) Deferred compensation plan assets:* Mutual funds and exchange traded funds $ 845 $ — $ — $ 845 Money market securities 2,213 — — 2,213 Total deferred compensation plan assets $ 3,058 $ — $ — $ 3,058
Investments	The Company’s investments, other than money market securities for which there is no unrealized gain or loss, at December 30, 2017 and April 1, 2017 were as follows (in thousands): Unrealized December 30, 2017 Cost Gain Loss Fair Value Available-for-sale securities (current): U.S. treasury fund $ 10,465 $ — $ (18 ) $ 10,447 Commercial paper 28,322 — — 28,322 Corporate Bonds 2,205 — (1 ) 2,204 Total investments (current) $ 40,992 $ — $ (19 ) $ 40,973 Available-for-sale securities (non-current): Mutual funds, exchange traded funds and money market securities* $ 3,322 $ 271 $ — $ 3,593 Total investments (non-current) $ 3,322 $ 271 $ — $ 3,593 Unrealized April 1, 2017 Cost Gain Loss Fair Value Available-for-sale securities (current): Commercial paper $ 10,688 $ — $ — $ 10,688 Total investments (current) $ 10,688 $ — $ — $ 10,688 Available-for-sale securities (non-current): Mutual funds, exchange traded funds and money market securities* $ 2,974 $ 84 $ — $ 3,058 Total investments (non-current) $ 2,974 $ 84 $ — $ 3,058

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Dec. 30, 2017
Inventory Disclosure [Abstract]
Components of Inventories	Components of inventories were as follows: (In thousands) Dec 30, 2017 Apr 1, 2017 Raw materials and purchased parts $ 50,720 $ 41,383 Work-in-process 18,737 13,829 Finished goods 5,045 3,730 $ 74,502 $ 58,942

Other Assets (Tables)

Other Assets (Tables)	9 Months Ended
	Dec. 30, 2017
Other Assets, Noncurrent Disclosure [Abstract]
Other Assets	Other assets consisted of the following: (In thousands) Dec 30, 2017 Apr 1, 2017 Demo and leased equipment, net $ 8,636 $ 11,011 Long term deposits and non-trade receivables 2,620 2,872 Non-current restricted cash 1,087 1,090 Non-current deferred income taxes, net 827 890 Other non-current assets 4,169 3,958 $ 17,339 $ 19,821

Accrued Liabilities (Current)30

Accrued Liabilities (Current) Other Liabilities Disclosure (Tables)	9 Months Ended
	Dec. 30, 2017
Other Liabilities Disclosure [Abstract]
Schedule of Accrued Liabilities [Table Text Block]	Accrued liabilities consisted of the following: (In thousands) Dec 30, 2017 Apr 1, 2017 Payroll-related liabilities $ 12,841 $ 6,335 Customer deposits 11,431 1,242 Product warranty accrual 4,506 3,394 Purchase order commitments and receipts 3,014 2,522 Restructuring costs payable 2,608 4,996 Professional fees payable 832 734 Current portion, long-term debt 415 434 Other current liabilities 4,744 2,529 $ 40,391 $ 22,186
Other Noncurrent Liabilities [Table Text Block]	ncluded in other current liabilities above are accrued amounts for value-added taxes, income taxes, freight, and other similar items.

Product Warranty (Tables)

Product Warranty (Tables)	9 Months Ended
	Dec. 30, 2017
Product Warranties Disclosures [Abstract]
Reconciliation of the Change in Aggregate Accrual for Product Warranty	The following is a reconciliation of the changes in the aggregate product warranty accrual: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Product warranty accrual, beginning $ 7,156 $ 5,521 $ 5,474 $ 5,734 Warranty charges incurred, net (3,273 ) (1,674 ) (8,384 ) (4,988 ) Provision for warranty charges 5,067 1,064 11,860 4,165 Product warranty accrual, ending $ 8,950 $ 4,911 $ 8,950 $ 4,911

Deferred Revenue (Tables)

Deferred Revenue (Tables)	9 Months Ended
	Dec. 30, 2017
Deferred Revenue Disclosure [Abstract]
Reconciliation of the Changes in Deferred Revenue	The following is a reconciliation of the changes in deferred revenue: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Deferred revenue, beginning $ 15,616 $ 11,583 $ 15,397 $ 7,685 Revenue deferred 51,191 9,075 66,661 28,547 Revenue recognized (54,420 ) (9,440 ) (69,671 ) (25,014 ) Deferred revenue, ending $ 12,387 $ 11,218 $ 12,387 $ 11,218 Of the total of $12.4 million and $11.2 million of deferred revenue at December 30, 2017 and December 31, 2016 , $0.4 million and $0.4 million were non-current and were included in Other liabilities on the Condensed Consolidated Balance Sheets.

Long-term Debt Debt Outstanding

Long-term Debt Debt Outstanding (Tables)	9 Months Ended
	Dec. 30, 2017
Debt Instrument [Line Items]
Schedule of Debt [Table Text Block]	Total debt outstanding on the Loan Agreement were as follows: (In thousands) Dec 30, 2017 Apr 1, 2017 Total debt outstanding $ 13,290 $ 13,923 Less: Current portion, long-term debt (415 ) (434 ) Long-term debt $ 12,875 $ 13,489

Share-Based Compensation Expens

Share-Based Compensation Expense (Tables)	9 Months Ended
	Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	hare-based compensation expense under the stock incentive plans is included in the Company’s Condensed Consolidated Statements of Operations as follows: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Cost of sales $ 64 $ 142 $ 208 $ 398 Selling, general and administrative 498 1,391 2,629 3,573 Research, development and engineering 151 285 484 656 Total share-based compensation expense $ 713 $ 1,818 $ 3,321 $ 4,627

Product and Geographic Inform35

Product and Geographic Information (Tables)	9 Months Ended
	Dec. 30, 2017
Product ang Geographic Information Reporting [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Printed Circuit Board $ 83,799 $ 15,987 $ 179,658 $ 60,432 Component Test 7,473 5,407 23,331 14,999 Semiconductor 12,351 6,690 31,116 21,521 Industrial Machining 7,217 5,695 20,386 14,153 Net Sales $ 110,840 $ 33,779 $ 254,491 $ 111,105
Revenue from External Customers by Geographic Areas [Table Text Block]	Net sales by geographic area, based on the location of the end user, were as follows: Fiscal quarter ended Three fiscal quarters ended (In thousands) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Asia $ 103,069 $ 26,015 $ 233,685 $ 92,184 Americas 2,431 6,210 9,537 11,464 Europe 5,340 1,554 11,269 7,457 Net Sales $ 110,840 $ 33,779 $ 254,491 $ 111,105

Restructuring and Cost Manage36

Restructuring and Cost Management Plans (Tables)	9 Months Ended
	Dec. 30, 2017
Restructuring and Related Activities [Abstract]
Amounts Related to Restructuring Costs Payable	The following table presents the amounts payable related to the 2017 Corporate Restructuring (in thousands): Employee severance and related personnel costs Site closure costs Current asset impairments and other gross profit charges (1) Non-current asset impairments Other Costs Total Balance as of April 2, 2016 $ — $ — $ — $ — $ — $ — Costs incurred 3,588 888 1,669 1,376 66 7,587 Cash payments (341 ) — — — (66 ) (407 ) Non-cash items — — (1,669 ) (1,376 ) — (3,045 ) Balance as of April 1, 2017 $ 3,247 $ 888 $ — $ — $ — $ 4,135 Costs incurred 1,284 824 13,278 1,657 175 17,218 Cash (payments) receipts (3,788 ) (1,389 ) (1,750 ) 32 (175 ) (7,070 ) Non-cash items — — (10,876 ) (1,689 ) — (12,565 ) Balance as of December 30, 2017 $ 743 $ 323 $ 652 $ — $ — $ 1,718 (1) Asset and facilities costs include inventory charges recorded in cost of sales. The following table presents the amounts related to restructuring costs payable (in thousands): Restructuring & cost management amounts payable as of April 2, 2016 $ 757 Cash payments and other adjustments (297 ) Costs incurred 401 Restructuring & cost management amounts payable as of April 1, 2017 861 Cash payments and other adjustments (380 ) Costs incurred 409 Restructuring & cost management amounts payable as of December 30, 2017 $ 890

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	9 Months Ended
	Dec. 30, 2017
Earnings Per Share [Abstract]
Reconciliation of Weighted Average Shares Outstanding Used in Calculation of Basic and Diluted Earnings Per Share	The following is a reconciliation of weighted average shares outstanding used in the calculation of basic and diluted earnings (loss) per share: Fiscal quarter ended Three fiscal quarters ended (In thousands, except per share data) Dec 30, 2017 Dec 31, 2016 Dec 30, 2017 Dec 31, 2016 Net income (loss) $ 33,973 $ (9,693 ) $ 41,135 $ (19,486 ) Weighted average shares used for basic earnings per share 34,224 32,919 33,839 32,379 Incremental diluted shares 1,786 — 1,723 — Weighted average shares used for diluted earnings per share 36,010 32,919 35,562 32,379 Net income (loss) per share: Basic $ 0.99 $ (0.29 ) $ 1.22 $ (0.60 ) Diluted $ 0.94 $ (0.29 ) $ 1.16 $ (0.60 )

Basis of Presentation Cash and

Basis of Presentation Cash and Cash Equivalents and Restricted Cash reconciliation (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017	Dec. 31, 2016	Apr. 02, 2016
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 62,251	$ 56,642	$ 44,891
Restricted Cash	1,087	1,090	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 63,338	$ 57,732	$ 44,891	$ 42,413

Fair Value Measurements - Inves

Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Apr. 01, 2017
Available For Sale Securities Current [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 40,973	$ 10,688
Available-for-sale Securities, Amortized Cost Basis	40,992	10,688
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(19)	0
Available For Sale Securities Current [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	10,447
Available-for-sale Securities, Amortized Cost Basis	10,465
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(18)
Available For Sale Securities Current [Member] | Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	28,322	10,688
Available-for-sale Securities, Amortized Cost Basis	28,322	10,688
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available For Sale Securities Current [Member] | Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	(1)
Available-for-sale Securities	2,204
Available-for-sale Securities, Amortized Cost Basis	2,205
Available-for-sale Securities, Gross Unrealized Gain	0
Available For Sale Securities Current [Member] | Repurchase Agreements [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	0
Available-for-sale Securities	0
Available-for-sale Securities, Amortized Cost Basis	0
Available-for-sale Securities, Gross Unrealized Gain	0
Available For Sale Securities Non Current [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	3,593	3,058	[1]
Available-for-sale Securities, Amortized Cost Basis	3,322	2,974	[1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	271	84	[1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0	[1]
Available For Sale Securities Non Current [Member] | Exchange traded funds and money market securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	3,593	3,058	[1]
Available-for-sale Securities, Amortized Cost Basis	3,322	2,974	[1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	271	84	[1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 0	$ 0	[1]
[1]	*These investments represent assets held in trust for the deferred compensation plan

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Hierarchy (Details) - USD ($) $ in Thousands		Dec. 30, 2017	Apr. 01, 2017
Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 28,686	$ 27,340
Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		24,537	22,395
Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		4,149	4,945
Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0	0
Cash Equivalents [Member] | Money Market Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		24,537	22,395
Cash Equivalents [Member] | Money Market Instruments [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		24,537	22,395
Cash Equivalents [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		4,149	4,945
Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			0
Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		4,149	4,945
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		36,824	5,743
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		10,447	0
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		26,377	5,743
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0	0
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		24,173	5,743
Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0	0
Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		24,173	5,743
Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0	0
Short-term Investments [Member] | Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,204
Short-term Investments [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Short-term Investments [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,204
Short-term Investments [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Short-term Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		10,447
Short-term Investments [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		10,447
Short-term Investments [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Short-term Investments [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Foreign Exchange Forward [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			(18)
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			0
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			(18)
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			0
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(72)
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		0
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(72)
Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		0
Deferred Compensation Plan Asset [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	3,593	3,058
Deferred Compensation Plan Asset [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	3,593	3,058
Deferred Compensation Plan Asset [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Deferred Compensation Plan Asset [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Deferred Compensation Plan Asset [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets		2,634	845
Deferred Compensation Plan Asset [Member] | Exchange Traded Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	2,634	845
Deferred Compensation Plan Asset [Member] | Exchange Traded Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Deferred Compensation Plan Asset [Member] | Exchange Traded Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Deferred Compensation Plan Asset [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	959	2,213
Deferred Compensation Plan Asset [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	959	2,213
Deferred Compensation Plan Asset [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Deferred Compensation Plan Asset [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	[1]	0	0
Japan, Yen | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			9
Obligations, Fair Value Disclosure		(1)
Japan, Yen | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			9
Obligations, Fair Value Disclosure		(1)
Taiwan, New Dollars | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		11	20
Taiwan, New Dollars | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		11	20
Korea (South), Won | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			39
Obligations, Fair Value Disclosure		(4)
Korea (South), Won | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			39
Obligations, Fair Value Disclosure		(4)
Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(14)	(96)
Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(14)	(96)
United Kingdom, Pounds | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			16
United Kingdom, Pounds | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(13)	(16)
United Kingdom, Pounds | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(13)
China, Yuan Renminbi | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		(51)	(5)
China, Yuan Renminbi | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure		$ (51)	(5)
Singapore, Dollars | Foreign Exchange Forward [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			(1)
Singapore, Dollars | Foreign Exchange Forward [Member] | Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			$ (1)
[1]	*These investments represent assets held in trust for the deferred compensation plan

Trade Accounts Receivable (Deta

Trade Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Trade Accounts Receivable [Abstract]
Accounts Receivable, Net, Noncurrent	$ 65	$ 489
Accounts Receivable, Net, Current	75,674	40,494
Accounts Receivable, Net	$ 75,739	$ 40,983

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Inventory Disclosure [Abstract]
Raw materials and purchased parts	$ 50,720	$ 41,383
Work-in-process	18,737	13,829
Finished goods	5,045	3,730
Inventories	$ 74,502	$ 58,942

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016	Apr. 01, 2017
Other Assets, Noncurrent Disclosure [Abstract]
Demo equipment depreciation expense	$ 600	$ 100	$ 800	$ 300
Consignment and demo equipment, net	8,636		8,636		$ 11,011
Long term deposits	2,620		2,620		2,872
Restricted Cash, Noncurrent	1,087		1,087		1,090
Deferred Income Taxes and Other Assets, Noncurrent	827		827		890
Accounts Receivable, Net	75,739		75,739		40,983
Other	4,169		4,169		3,958
Other assets	$ 17,339		$ 17,339		$ 19,821

Other Assets - Additional Infor

Other Assets - Additional Information (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Schedule of Cost-method Investments [Line Items]
Consignment and demo equipment, net	$ 8,636	$ 11,011

Other Assets Other assets other

Other Assets Other assets other details (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Demo equipment depreciation expense	$ 0.6	$ 0.1	$ 0.8	$ 0.3

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Disclosure Accrued Liabilities [Abstract]
Payroll-related liabilities	$ 12,841	$ 6,335
Product Warranty Accrual, Current	4,506	3,394
Customer Deposits, Current	11,431	1,242
Purchase order commitments and receipts	3,014	2,522
Accrued Professional Fees, Current	832	734
Long-term Debt, Current Maturities	415	434
Restructuring Reserve	2,608	4,996
Other	4,744	2,529
Accrued liabilities	$ 40,391	$ 22,186

Product Warranty (Details)

Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Product Warranty
Standard and Extended Product Warranty Accrual	$ 7,156	$ 5,521	$ 5,474	$ 5,734
Warranty charges incurred, net	(3,273)	(1,674)	(8,384)	(4,988)
Provision for warranty charges	5,067	1,064	11,860	4,165
Standard and Extended Product Warranty Accrual	8,950	4,911	8,950	4,911
Product Warranty Accrual, Noncurrent	$ 4,544	$ 800	$ 4,544	$ 800
Document Period End Date			Dec. 30, 2017

Deferred Revenue (Details)

Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Deferred Revenue Disclosure [Abstract]
Deferred Revenue, Period Start	$ 15,616	$ 11,583	$ 15,397	$ 7,685
Deferred Revenue, Noncurrent	405	400	405	400
Revenue deferred	51,191	9,075	66,661	28,547
Revenue recognized	(54,420)	(9,440)	(69,671)	(25,014)
Deferred Revenue, Period Start	$ 12,387	$ 11,218	$ 12,387	$ 11,218

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Debt Disclosure [Abstract]
Debt Issuance Costs, Net	$ 311	$ 337

Long-term Debt Long-term debt t

Long-term Debt Long-term debt table (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Apr. 01, 2017
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 13,290	$ 13,923
Long-term Debt, Current Maturities	(415)	(434)
Long-term Debt	$ 12,875	$ 13,489

Long-term Debt Maturities of LT

Long-term Debt Maturities of LT Debt (Details) $ in Thousands	Dec. 30, 2017USD ($)
Debt Disclosure [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 449
Long-term Debt, Maturities, Repayments of Principal in Year Four	518
Long-term Debt, Maturities, Repayments of Principal in Year Three	492
Long-term Debt, Maturities, Repayments of Principal in Year Two	471
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 543

Shareholders' Equity - Share re

Shareholders' Equity - Share repurchase (Details) $ in Millions	Dec. 09, 2011USD ($)
Statement of Stockholders' Equity [Abstract]
Stock Repurchase Program, Authorized Amount	$ 20

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			$ 963
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0
Stockholders' Equity Attributable to Parent			144,531
Stockholders' Equity Attributable to Parent	$ 190,807		190,807
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	581	$ (745)	969	$ (884)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	4	5	13	14
Other Comprehensive Income (Loss), Net of Tax	568	(742)	964	(876)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(17)	$ (2)	(18)	$ (6)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			961
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0
Stockholders' Equity Attributable to Parent			(1,242)
Stockholders' Equity Attributable to Parent	(273)		(273)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			8
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			20
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0
Stockholders' Equity Attributable to Parent			45
Stockholders' Equity Attributable to Parent	58		58
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			(7)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent			(1,214)
Stockholders' Equity Attributable to Parent	(250)		(250)
Equity Securities [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(18)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0
Stockholders' Equity Attributable to Parent			(17)
Stockholders' Equity Attributable to Parent	$ (35)		(35)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			$ 0

Share-Based Compensation - Expe

Share-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense	$ 713	$ 1,818	$ 3,321	$ 4,627
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			2 years 4 months 3 days
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense	64	142	$ 208	398
Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense	498	1,391	2,629	3,573
Research and Development Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense	151	$ 285	$ 484	$ 656
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			442,400
Market-based [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			222,400
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 8,000		$ 8,000

Product and Geographic Inform55

Product and Geographic Information Revenue from Product Market (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenue, Net	$ 110,840	$ 33,779	$ 254,491	$ 111,105
Printed Circuit Board [Member]
Revenue from External Customer [Line Items]
Revenue, Net	83,799	15,987	179,658	60,432
Component Test [Member] [Member]
Revenue from External Customer [Line Items]
Revenue, Net	7,473	5,407	23,331	14,999
Semiconductor [Member]
Revenue from External Customer [Line Items]
Revenue, Net	12,351	6,690	31,116	21,521
Industrial Machining [Member]
Revenue from External Customer [Line Items]
Revenue, Net	$ 7,217	$ 5,695
Industrial Machining [Member]
Revenue from External Customer [Line Items]
Revenue, Net			$ 20,386	$ 14,153

Product and Geographic Inform56

Product and Geographic Information Revenue from Geographic Location table (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenue, Net	$ 110,840	$ 33,779	$ 254,491	$ 111,105
Asia [Member]
Revenue from External Customer [Line Items]
Revenue, Net	103,069	26,015	233,685	92,184
Americas [Member]
Revenue from External Customer [Line Items]
Revenue, Net	2,431	6,210	9,537	11,464
Europe [Member]
Revenue from External Customer [Line Items]
Revenue, Net	$ 5,340	$ 1,554	$ 11,269	$ 7,457

Restructuring and Cost Manage57

Restructuring and Cost Management Plans - Amounts Related to Restructuring Costs Payable (Details) - USD ($) $ in Thousands		6 Months Ended		9 Months Ended		12 Months Ended
		Jul. 01, 2017		Dec. 30, 2017		Apr. 01, 2017
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				$ 4,996
Restructuring Reserve End				2,608		$ 4,996
Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 24,804		17,218		7,587
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				4,135		0
Restructuring Reserve End				1,718		4,135
Q4 FY17 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		4,872		1,284		3,588
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				3,247		0
Restructuring Reserve End				743		3,247
Q4 FY17 Restructuring Plan [Member] | Current Asset Impairments and Other Gross Profit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 14,947	[1]	13,278	[2]	1,669	[2]
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start	[2]			0		0
Restructuring Reserve End	[2]			652		0
Q4 FY17 Restructuring Plan [Member] | Site Closures and Non-current Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				2,481
Chelmsford Plan [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				409		401
Restructuring Reserve [Roll Forward]
Restructuring Reserve Start				861		757
Restructuring Reserve End				$ 890		$ 861
[1]	(1) Current asset impairments include inventory charges recorded in cost of sales.
[2]	(1) Asset and facilities costs include inventory charges recorded in cost of sales.

Restructuring and Cost Manage58

Restructuring and Cost Management Plans Q4 FY17 Restructuring Plan Expected Costs (Details) - Q4 FY17 Restructuring Plan [Member] - USD ($) $ in Thousands		6 Months Ended		9 Months Ended		12 Months Ended
		Jul. 01, 2017		Dec. 30, 2017		Apr. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost				$ 24,804
Restructuring and Related Cost, Incurred Cost		$ 24,804		17,218		$ 7,587
Restructuring and Related Cost, Expected Cost Remaining				0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost				4,872
Restructuring and Related Cost, Incurred Cost		4,872		1,284		3,588
Restructuring and Related Cost, Expected Cost Remaining				0
Site Closures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost				1,714
Restructuring and Related Cost, Incurred Cost		1,714		824		888
Restructuring and Related Cost, Expected Cost Remaining				0
Current Asset Impairments and Other Gross Profit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	[1]			14,947
Restructuring and Related Cost, Incurred Cost		14,947	[1]	13,278	[2]	1,669	[2]
Restructuring and Related Cost, Expected Cost Remaining	[1]			0
Non-Current Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost				3,032
Restructuring and Related Cost, Incurred Cost		3,032		1,657		1,376
Restructuring and Related Cost, Expected Cost Remaining				0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost				239
Restructuring and Related Cost, Incurred Cost		$ 239		175		$ 66
Restructuring and Related Cost, Expected Cost Remaining				$ 0
[1]	(1) Current asset impairments include inventory charges recorded in cost of sales.
[2]	(1) Asset and facilities costs include inventory charges recorded in cost of sales.

Restructuring and Cost Manage59

Restructuring and Cost Management Plans Q4 FY17 Restructuring Plan Accrual Reconciliation (Details) - USD ($) $ in Thousands		6 Months Ended		9 Months Ended		12 Months Ended
		Jul. 01, 2017		Dec. 30, 2017		Apr. 01, 2017		Apr. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				$ 2,608		$ 4,996
Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				1,718		4,135		$ 0
Restructuring and Related Cost, Incurred Cost		$ 24,804		17,218		7,587
Payments for Restructuring				(7,070)		(407)
Restructuring Reserve, Settled without Cash				(12,565)		(3,045)
Site Closures [Member] | Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				323		888		0
Restructuring and Related Cost, Incurred Cost		1,714		824		888
Payments for Restructuring				(1,389)		0
Restructuring Reserve, Settled without Cash				0		0
Current Asset Impairments and Other Gross Profit [Member] | Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	[1]			652		0		0
Restructuring and Related Cost, Incurred Cost		14,947	[2]	13,278	[1]	1,669	[1]
Payments for Restructuring	[1]			(1,750)		0
Restructuring Reserve, Settled without Cash	[1]			(10,876)		(1,669)
Non-Current Asset Impairments [Member] | Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				0		0		0
Restructuring and Related Cost, Incurred Cost		3,032		1,657		1,376
Payments for Restructuring						0
Cash receipt for disposal of restructured assets				32
Restructuring Reserve, Settled without Cash				(1,689)		(1,376)
Other Restructuring [Member] | Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				0		0		0
Restructuring and Related Cost, Incurred Cost		239		175		66
Payments for Restructuring				(175)		(66)
Restructuring Reserve, Settled without Cash				0		0
Employee Severance [Member] | Q4 FY17 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				743		3,247		$ 0
Restructuring and Related Cost, Incurred Cost		$ 4,872		1,284		3,588
Payments for Restructuring				(3,788)		(341)
Restructuring Reserve, Settled without Cash				$ 0		$ 0
[1]	(1) Asset and facilities costs include inventory charges recorded in cost of sales.
[2]	(1) Current asset impairments include inventory charges recorded in cost of sales.

Restructuring and Cost Manage60

Restructuring and Cost Management Plans Chelmsford Restructuring Plan Accrual (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 30, 2017	Apr. 01, 2017	Apr. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 2,608	$ 4,996
Chelmsford Plan [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	890	861	$ 757
Payments for Restructuring	(380)	(297)
Restructuring and Related Cost, Incurred Cost	$ 409	$ 401

Earnings (Loss) Per Share - Rec

Earnings (Loss) Per Share - Reconciliation of Weighted Average Shares Outstanding Used in Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 33,973	$ (9,693)	$ 41,135	$ (19,486)
Weighted average number of shares - basic	34,224	32,919	33,839	32,379
Weighted Average Number Diluted Shares Outstanding Adjustment	1,786	0	1,723	0
Net (loss) income per share - basic	$ 0.99	$ (0.29)	$ 1.22	$ (0.60)
Net (loss) income per share - diluted	$ 0.94	$ (0.29)	$ 1.16	$ (0.60)

Earnings (Loss) Per Share - Add

Earnings (Loss) Per Share - Additional Information (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of shares that are not included in the calculation of diluted net earnings per share	0.1	2.8	0.4	2.5

Business Acquisitions - Allocat

Business Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed Based on the Fair Value (Details) - USD ($) $ in Thousands	Aug. 01, 2016	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016	Apr. 01, 2017	Jan. 15, 2015
Business Acquisition [Line Items]
Allocated acquisition related compensation expenses - share based		$ 1,700		$ 1,700
Goodwill		2,626		2,626		$ 3,027
Business Combination, Integration Related Costs		$ 0	$ 31	$ 0	$ 366
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables Allowance							$ 268
Visicon [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	$ 391
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	982
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	6,200
Payments to Acquire Businesses, Gross	116
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	$ 737
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	603,939
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 4,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	3,300
Goodwill	2,626
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(1,952)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets	$ 26

Business Acquisitions Business

Business Acquisitions Business Acquisition details (Details) - Visicon [Member] $ in Thousands	Aug. 01, 2016USD ($)shares
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3,300
Payments to Acquire Businesses, Gross	$ 2,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	603,939
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 4,200
Developed Technology Rights [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 2,000