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Customers That Accounted for at Least Ten percent of Accounts Receivable (Detail) (Accounts Receivable, Credit Concentration Risk)
 12 Months Ended
Jan. 03, 2015
Dec. 31, 2013
Seagate Technology
    
Concentration Risk [Line Items]    
Concentration risk, percentage 46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ivac_SeagateTechnologyMember		 40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ivac_SeagateTechnologyMember
U.S. Government
    
Concentration Risk [Line Items]    
Concentration risk, percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ivac_UnitedStatesGovernmentMember		    [1]
Northrop Grumman Corporation
    
Concentration Risk [Line Items]    
Concentration risk, percentage    [1] 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ivac_NorthropGrummanCorporationMember
[1] Less than 10%