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Stock-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended
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Apr. 03, 2015 | Apr. 04, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term | 10 years |
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of annual bonus settled with fully vested restricted stock unit awards | 40.00%expo_PercentageOfAnnualBonusSettledWithVestedRestrictedStockUnitAwards / us-gaap_RangeAxis = us-gaap_MaximumMember |
Unvested Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock based compensation, vesting period | 4 years |
Unvested Restricted Stock | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Recipient age to expense award on grant date | 59 years 6 months |
Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock based compensation expense | $ 397,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 480,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Vesting percentage of stock options granted per year | 25.00%expo_ShareBasedCompensationArrangementByShareBasedPaymentAwardsAnnualVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Stock based compensation, vesting period | 4 years |
Vested Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock based compensation expense | 1,693,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = expo_VestedRestrictedStockAwardsMember | 1,586,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = expo_VestedRestrictedStockAwardsMember
Stock based compensation, holding period | 4 years |
Unvested Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock based compensation expense | $ 3,131,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = expo_UnvestedRestrictedStockAwardsMember | $ 3,227,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = expo_UnvestedRestrictedStockAwardsMember
Unvested Stock Options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Recipient age to expense award on grant date | 59 years 6 months |

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- Definition Percentage of Annual Bonus Settled With Vested Restricted Stock Unit Awards + References No definition available. + Details
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- Definition Share-Based Awards, Recipient Retirement Age + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award annual vesting percentage. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options expiration term. + References No definition available. + Details
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- Definition Vested restricted stock awards holding period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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