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Operations in Different Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2015 | Oct. 03, 2014 | Jul. 04, 2014 | Apr. 04, 2014 | Jan. 03, 2014 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
OperationsIn Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net | $ 28,264 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | $ 28,721 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | $ 28,264 us-gaap_PropertyPlantAndEquipmentNet |  | $ 28,721 us-gaap_PropertyPlantAndEquipmentNet |  |  |
Revenues | 73,611 us-gaap_Revenues | 78,557 us-gaap_Revenues | 76,574 us-gaap_Revenues | 75,962 us-gaap_Revenues | 72,772 us-gaap_Revenues | 75,231 us-gaap_Revenues | 75,505 us-gaap_Revenues | 72,660 us-gaap_Revenues | 304,704 us-gaap_Revenues | [1] | 296,168 us-gaap_Revenues | [1] | 292,653 us-gaap_Revenues | [1]
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
OperationsIn Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net | 27,761 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_UsaMember |  |  |  | 28,076 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_UsaMember |  |  |  | 27,761 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_UsaMember |  | 28,076 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_UsaMember |  |  |
Revenues |  |  |  |  |  |  |  |  | 273,635 us-gaap_Revenues / dei_LegalEntityAxis = expo_UsaMember | [1] | 263,341 us-gaap_Revenues / dei_LegalEntityAxis = expo_UsaMember | [1] | 260,760 us-gaap_Revenues / dei_LegalEntityAxis = expo_UsaMember | [1]
Foreign Countries |  |  |  |  |  |  |  |  |  |  |  |  |  |
OperationsIn Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net | 503 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_ForeignCountriesMember |  |  |  | 645 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_ForeignCountriesMember |  |  |  | 503 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_ForeignCountriesMember |  | 645 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = expo_ForeignCountriesMember |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 31,069 us-gaap_Revenues / dei_LegalEntityAxis = expo_ForeignCountriesMember | [1] | $ 32,827 us-gaap_Revenues / dei_LegalEntityAxis = expo_ForeignCountriesMember |  | $ 31,893 us-gaap_Revenues / dei_LegalEntityAxis = expo_ForeignCountriesMember | [1]
[1] | Geographic revenues are allocated based on the location of the client.

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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