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Deferred Compensation Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Trading securities | $ 43,848,000 us-gaap_TradingSecurities / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | $ 37,979,000 us-gaap_TradingSecurities / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember |
Deferred compensation plan vested amounts due | 45,394,000 expo_DeferredCompensationPlanVestedAmountsDue / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | 37,926,000 expo_DeferredCompensationPlanVestedAmountsDue / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember |
Change in market value of trust assets | $ 2,525,000 expo_ChangeInMarketValueOfDeferredCompensationTrustAssets / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | $ 6,044,000 expo_ChangeInMarketValueOfDeferredCompensationTrustAssets / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | $ 2,158,000 expo_ChangeInMarketValueOfDeferredCompensationTrustAssets / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember
Maximum |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Percentage of compensation deferred | 100.00%expo_PercentageOfCompensationDeferredUnderDeferredCompensationArrangement / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Deferred Compensation Plan Vested Amounts Due. + References No definition available. + Details
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- Definition Percentage of Compensation Deferred under Deferred Compensation Arrangement + References No definition available. + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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