XML 13 R33.htm IDEA: XBRL DOCUMENT v2.4.0.8

Deferred Compensation Plan - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 04, 2014	Mar. 29, 2013	Jan. 03, 2014
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading securities	$ 43,165,000		$ 37,979,000
Deferred compensation plan vested amounts due	44,874,000		37,926,000
Change in market value of trust assets	$ 731,000	$ 2,066,000
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage of compensation deferred	100.00%

X

- Definition

Change In Market Value Of Deferred Compensation Trust Assets.

+ References

No definition available.

+ Details

Name:	expo_ChangeInMarketValueOfDeferredCompensationTrustAssets
Namespace Prefix:	expo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Compensation Plan Vested Amounts Due.

+ References

No definition available.

+ Details

Name:	expo_DeferredCompensationPlanVestedAmountsDue
Namespace Prefix:	expo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of Compensation Deferred under Deferred Compensation Arrangement

+ References

No definition available.

+ Details

Name:	expo_PercentageOfCompensationDeferredUnderDeferredCompensationArrangement
Namespace Prefix:	expo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

Name:	us-gaap_TradingSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant