Lessee, operating lease, annual rent payment, adjustment year one.

No definition available.

Name:	expo_LesseeOperatingLeaseAnnualRentPaymentAdjustmentYearOne
Namespace Prefix:	expo_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Lessee, operating lease, annual rent payment, adjustment year two.

+ References

No definition available.

+ Details

Name:	expo_LesseeOperatingLeaseAnnualRentPaymentAdjustmentYearTwo
Namespace Prefix:	expo_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of options to renew lease.

+ References

No definition available.

+ Details

Name:	expo_NumberOfOptionsToRenewLease
Namespace Prefix:	expo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of states in which entity has lease arrangements.

+ References

No definition available.

+ Details

Name:	expo_NumberOfStatesInWhichEntityHasLeaseArrangements
Namespace Prefix:	expo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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

- Definition

Indicates (true false) whether lessee has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseExistenceOfOptionToExtend
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

+ Details

Name:	us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

+ Details

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

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

Name:	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LeaseContractualTermAxis=expo_OfficeLaboratoryAndStorageSpaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseContractualTermAxis=expo_PhoenixArizonaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=expo_OperatingLeasePaymentPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=expo_OperatingLeasePaymentPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Additional Information (Detail)		3 Months Ended	12 Months Ended
Leases - Additional Information (Detail)	Jun. 19, 2024 USD ($)	Jun. 28, 2024 USD ($)	Jan. 03, 2025 USD ($) a State Option	Dec. 29, 2023 USD ($)	Dec. 30, 2022 USD ($)
Lessee Lease Description [Line Items]
Lease payment obligation per year			$ 130,498,000
Additional right-of-use asset in exchange for operating lease liability			$ 58,032,000	$ 15,749,000	$ 9,476,000
Office, Laboratory, and Storage Space [Member]
Lessee Lease Description [Line Items]
Number of States in which Entity Has Lease Arrangements \| State			13
Office, Laboratory, and Storage Space [Member] \| Minimum
Lessee Lease Description [Line Items]
Lessee, Operating Lease, Term of Contract			1 year
Office, Laboratory, and Storage Space [Member] \| Maximum
Lessee Lease Description [Line Items]
Lessee, Operating Lease, Term of Contract			10 years
Phoenix Arizona [Member]
Lessee Lease Description [Line Items]
Lessee, Operating Lease, Term of Contract			30 years
Area of Land \| a			147
Number of Options to Renew Lease \| Option			2
Lessee, Operating Lease, Option to Extend			The Company leases this land from the state of Arizona under a 30-year lease agreement that expires in January of 2028 and has options to renew for two 15-year periods.
Lessee, Operating Lease, Existence of Option to Extend [true false]			true
Lessee, Operating Lease, Renewal Term	15 years		15 years
Annual rent payment adjustment year one	2033
Annual rent payment adjustment year two	2038
Additional right-of-use asset in exchange for operating lease liability		$ 48,683,000
Phoenix Arizona [Member] \| Lease Period Until January 16, 2028 [Member]
Lessee Lease Description [Line Items]
Lease payment obligation per year	$ 1,009,000
Phoenix Arizona [Member] \| Lease Period After January 16, 2028 [Member]
Lessee Lease Description [Line Items]
Lease payment obligation per year	$ 6,183,000