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Revenue Recognition- Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Jan. 01, 2021 | Jan. 03, 2020
Revenue Recognition [Abstract] |  |  |
Deferred Revenue, Revenue Recognized | $ 8,387,000 | $ 8,815,000 | $ 5,754,000
Subcontractor Fees Not Included In Revenues | $ 15,357,000 | $ 9,408,000 | $ 14,409,000

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- Definition The total amount of subcontractor fees not included in revenues. + 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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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration