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Business Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed Based on the Fair Value (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 27, 2014
Dec. 28, 2013
Sep. 20, 2013
Mar. 29, 2014
May 03, 2013
Business Acquisition [Line Items]              
Goodwill $ 7,889,000us-gaap_Goodwill   $ 7,889,000us-gaap_Goodwill     $ 7,889,000us-gaap_Goodwill  
Gain on acquisition of Semiconductor Systems business 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 499,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount      
Cash paid for business acquisitions     0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (9,731,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Semiconductor Systems business [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             10,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
Payments to Acquire Businesses, Gross         9,700,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
   
Acquired intangibles             700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
Business Acquisition, Purchase Price Allocation, Current Liabilities             (2,300,000)us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory             8,200,000us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables             3,900,000us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
Semiconductor Systems Business [Member] [Member]              
Business Acquisition [Line Items]              
Business Combination, Bargain Purchase, Total Gain   (800,000)esio_BusinessCombinationBargainPurchaseTotalGain
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsBusinessMemberMember
         
Business Combination, Bargain Purchase, Tax   300,000esio_BusinessCombinationBargainPurchaseTax
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsBusinessMemberMember
         
Order or Production Backlog [Member] | Semiconductor Systems business [Member]              
Business Acquisition [Line Items]              
Acquired intangibles             500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
Developed technology | Semiconductor Systems business [Member]              
Business Acquisition [Line Items]              
Acquired intangibles             $ 200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= esio_SemiconductorSystemsbusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= esio_DevelopedTechnologyMember