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Leases - Additional Information (Detail) | Jan. 01, 2021 a State Option
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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, Renewal Term | 15 years

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- Definition Number of options to renew lease. + References No definition available. + Details
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Namespace Prefix: | expo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of states in which entity has lease arrangements. + References No definition available. + Details
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Namespace Prefix: | expo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of land held. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |