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v2.4.1.9

Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Apr. 03, 2015 | Apr. 04, 2014
Segment Reporting Information [Line Items] |  |
Revenues | $ 80,293 us-gaap_Revenues | $ 75,962 us-gaap_Revenues
Operating Income | 15,028 us-gaap_OperatingIncomeLoss | 14,094 us-gaap_OperatingIncomeLoss
Capital Expenditures | 627 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 915 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Depreciation and Amortization | 1,381 us-gaap_DepreciationAndAmortization | 1,322 us-gaap_DepreciationAndAmortization
Engineering and Other Scientific |  |
Segment Reporting Information [Line Items] |  |
Revenues | 59,801 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember | 55,827 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember
Operating Income | 19,245 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember | 18,818 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember
Capital Expenditures | 392 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember | 530 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember
Depreciation and Amortization | 1,104 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember | 873 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = expo_EngineeringAndOtherScientificMember
Environmental and Health |  |
Segment Reporting Information [Line Items] |  |
Revenues | 20,492 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember | 20,135 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember
Operating Income | 6,464 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember | 5,973 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember
Capital Expenditures | 24 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember | 55 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember
Depreciation and Amortization | 43 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember | 47 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = expo_EnvironmentalAndHealthMember
Operating segments |  |
Segment Reporting Information [Line Items] |  |
Operating Income | 25,709 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 24,791 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Capital Expenditures | 416 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 585 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Depreciation and Amortization | 1,147 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 920 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Corporate |  |
Segment Reporting Information [Line Items] |  |
Operating Income | (10,681)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (10,697)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Capital Expenditures | 211 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 330 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation and Amortization | $ 234 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 402 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X
- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -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 1 -Article 5 + Details
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