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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 02, 2015
Jan. 03, 2014
Assets    
Money market securities $ 45,478us-gaap_CashAndCashEquivalentsFairValueDisclosure [1] $ 37,099us-gaap_CashAndCashEquivalentsFairValueDisclosure [1]
Total 114,239us-gaap_AssetsFairValueDisclosure 108,249us-gaap_AssetsFairValueDisclosure
Liabilities    
Deferred compensation plan 45,394expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure [2] 37,926expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure [2]
Total 45,394us-gaap_LiabilitiesFairValueDisclosure 37,926us-gaap_LiabilitiesFairValueDisclosure
Fixed income securities    
Assets    
Fixed income available for sale securities 24,913us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [3] 33,171us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [3]
Fixed income trading securities held in deferred compensation plan 9,672expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [4] 9,535expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [4]
Equity securities    
Assets    
Equity trading securities held in deferred compensation plan 34,176expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember		 [4] 28,444expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember		 [4]
Fair Value, Inputs, Level 1    
Assets    
Money market securities 45,478us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1] 37,099us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]
Total 89,326us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 75,078us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Liabilities    
Deferred compensation plan 45,394expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2] 37,926expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2]
Total 45,394us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 37,926us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | Fixed income securities    
Assets    
Fixed income available for sale securities 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3] 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3]
Fixed income trading securities held in deferred compensation plan 9,672expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [4] 9,535expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [4]
Fair Value, Inputs, Level 1 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan 34,176expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [4] 28,444expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [4]
Fair Value, Inputs, Level 2    
Assets    
Money market securities 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
Total 24,913us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 33,171us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities    
Deferred compensation plan 0expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2] 0expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]
Total 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | Fixed income securities    
Assets    
Fixed income available for sale securities 24,913us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 33,171us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3]
Fixed income trading securities held in deferred compensation plan 0expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4] 0expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]
Fair Value, Inputs, Level 2 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan 0expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4] 0expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]
Fair Value, Inputs, Level 3    
Assets    
Money market securities 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]
Total 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Liabilities    
Deferred compensation plan 0expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2] 0expo_DeferredCompensationPlanLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2]
Total 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | Fixed income securities    
Assets    
Fixed income available for sale securities 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [3] 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [3]
Fixed income trading securities held in deferred compensation plan 0expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [4] 0expo_DeferredCompensationPlanAssetsFixedIncomeTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [4]
Fair Value, Inputs, Level 3 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan $ 0expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [4] $ 0expo_DeferredCompensationPlanAssetsEquityTradingSecuritiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [4]
[1] Included in cash and cash equivalents on the Company’s consolidated balance sheet.
[2] Included in accrued liabilities and deferred compensation on the Company’s consolidated balance sheet.
[3] Included in short-term investments on the Company’s consolidated balance sheet.
[4] Included in other current assets and deferred compensation plan assets on the Company’s consolidated balance sheet.