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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Commitments And Contingencies Disclosure [Line Items] |  |  |
Purchase Obligation | $ 320,000 us-gaap_PurchaseObligation |  |
Property Leases [Member] |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Operating Leases, Rent Expense | 5,951,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember | 5,929,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember | 5,481,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Other Operating Leases and Commitments [Member] |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Operating Costs and Expenses | $ 1,965,000 us-gaap_LeaseAndRentalExpense / us-gaap_OtherCommitmentsAxis = expo_OtherOperatingLeasesAndCommitmentsMember | $ 1,704,000 us-gaap_LeaseAndRentalExpense / us-gaap_OtherCommitmentsAxis = expo_OtherOperatingLeasesAndCommitmentsMember | $ 1,754,000 us-gaap_LeaseAndRentalExpense / us-gaap_OtherCommitmentsAxis = expo_OtherOperatingLeasesAndCommitmentsMember

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- Details
Name: | expo_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | expo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=expo_OtherOperatingLeasesAndCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |