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Revenue Recognition - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 03, 2025	Dec. 29, 2023	Dec. 30, 2022
Revenue Recognition [Abstract]
Deferred Revenue, Revenue Recognized	$ 14,173,000	$ 14,463,000	$ 15,384,000
Subcontractor Fees Not Included In Revenues	$ 10,970,000	$ 12,268,000	$ 28,754,000

X

- 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

X

- 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
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration