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Cash, cash equivalents and short-term investments (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 03, 2015 | Jan. 02, 2015
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Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 145,015 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 154,380 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Unrealized Gains | 13 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 27 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Unrealized Losses | (2)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | (4)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Estimated Fair Value | 145,026 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure | 154,403 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 21,357 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 24,890 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Unrealized Gains | 13 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 27 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Unrealized Losses | (2)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | (4)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Estimated Fair Value | 21,368 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 24,913 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 48,940 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember | 45,478 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember
Unrealized Gains | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember
Unrealized Losses | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember
Estimated Fair Value | 48,940 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember | 45,478 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 123,658 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember | 129,490 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Unrealized Gains | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Unrealized Losses | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Estimated Fair Value | 123,658 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember | 129,490 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 74,718 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 84,012 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Unrealized Gains | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Unrealized Losses | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Estimated Fair Value | 74,718 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 84,012 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 48,940 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 45,478 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Unrealized Gains | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Unrealized Losses | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 0 expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Estimated Fair Value | 48,940 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 45,478 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
State and municipal bonds |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 21,357 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 24,890 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Unrealized Gains | 13 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 27 expo_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Unrealized Losses | (2)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | (4)expo_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Estimated Fair Value | $ 21,368 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | $ 24,913 expo_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember

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