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Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 03, 2015 | Jan. 02, 2015
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Fair Value Measurements [Line Items] |  |
Due within one year, Amortized Cost | $ 18,739 expo_AvailableForSaleSecuritiesShortTermInvestmentsAmortizedCostDueInYearOne |
Due between one and two years, Amortized Cost | 2,618 expo_AvailableForSaleSecuritiesShortTermInvestmentsAmortizedCostDueInYearTwo |
Total Amortized Cost | 21,357 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Due within one year, Estimated Fair Value | 18,750 expo_AvailableForSaleSecuritiesShortTermInvestmentsEstimatedFairValueDueInYearOne |
Due between one and two years, Estimated Fair Value | 2,618 expo_AvailableForSaleSecuritiesShortTermInvestmentsEstimatedFairValueDueInYearTwo |
Total Estimated Fair Value | $ 21,368 us-gaap_ShortTermInvestments | $ 24,913 us-gaap_ShortTermInvestments

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- Definition Available for sale securities short term investments amortized cost due in year one. + References No definition available. + Details
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Namespace Prefix: | expo_
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Balance Type: | debit
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- Definition Available For Sale Securities Short Term Investments Amortized Cost Due In Year Two + References No definition available. + Details
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Namespace Prefix: | expo_
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- Definition Available For Sale Securities Short Term Investments Estimated Fair Value Due In Year One + References No definition available. + Details
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- Definition Available For Sale Securities Short Term Investments Estimated Fair Value Due In Year Two + References No definition available. + Details
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Namespace Prefix: | expo_
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- Details
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Period Type: | duration

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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