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Miscellaneous Income, Net (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Miscellaneous Income, Net [Line Items] |  |  |
Rental income | $ 2,003 us-gaap_RentalIncomeNonoperating | $ 1,913 us-gaap_RentalIncomeNonoperating | $ 1,671 us-gaap_RentalIncomeNonoperating
Gain (loss) on deferred compensation investments | 2,525 expo_GainLossOnDeferredCompensationInvestments | 6,044 expo_GainLossOnDeferredCompensationInvestments | 2,158 expo_GainLossOnDeferredCompensationInvestments
(Loss) gain on foreign exchange | (293)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (89)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (61)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other | 31 us-gaap_OtherNonoperatingIncome | 4 us-gaap_OtherNonoperatingIncome | 33 us-gaap_OtherNonoperatingIncome
Total | $ 4,266 us-gaap_NonoperatingIncomeExpense | $ 7,872 us-gaap_NonoperatingIncomeExpense | $ 3,801 us-gaap_NonoperatingIncomeExpense

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- Definition This item represents the net total gain (loss) on deferred compensation investments included in earnings for the period. + References No definition available. + Details
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Namespace Prefix: | expo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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Period Type: | duration

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- Definition Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature. + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration