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Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |
Compensation and related expenses | $ 12,578 us-gaap_OtherLaborRelatedExpenses | $ 12,757 us-gaap_OtherLaborRelatedExpenses | $ 11,984 us-gaap_OtherLaborRelatedExpenses
General and administrative expenses | 501 us-gaap_OtherGeneralAndAdministrativeExpense | 411 us-gaap_OtherGeneralAndAdministrativeExpense | 394 us-gaap_OtherGeneralAndAdministrativeExpense
Total stock-based compensation expense | 13,079 us-gaap_ShareBasedCompensation | 13,168 us-gaap_ShareBasedCompensation | 12,378 us-gaap_ShareBasedCompensation
Income tax benefit | 5,141 expo_IncomeTaxBenefitAssociatedWithStockbasedCompensation | 5,195 expo_IncomeTaxBenefitAssociatedWithStockbasedCompensation | 4,844 expo_IncomeTaxBenefitAssociatedWithStockbasedCompensation
Restricted Stock [Member] |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |
Compensation and related expenses | 11,889 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 11,680 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 11,345 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
General and administrative expenses | 501 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 411 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 394 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Employee Stock Option [Member] |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |
Compensation and related expenses | $ 689 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1,077 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 639 us-gaap_OtherLaborRelatedExpenses / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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- Definition Income tax benefit associated with stock-based compensation. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Details
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- Details
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- Details
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