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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	May 23, 2006	Jul. 22, 2014 Subsequent Event
Limits On Use Of Authorized Capital Stock [Line Items]
Limits on use of authorized common stock shares	40
Limits on use of authorized preferred stock shares	2
Common stock, dividends per share declared, subsequent event		$ 0.25

X

- Definition

Authorized common stock shares limits on use.

+ References

No definition available.

+ Details

Name:	expo_AuthorizedCommonStockSharesLimitOnUse
Namespace Prefix:	expo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Authorized preferred stock shares limits on use.

+ References

No definition available.

+ Details

Name:	expo_AuthorizedPreferredStockSharesLimitOnUse
Namespace Prefix:	expo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate dividends declared for each share of common stock outstanding on date subsequent to period end date.

+ References

No definition available.

+ Details

Name:	expo_CommonStockDividendsPerShareDeclaredSubsequentEvent
Namespace Prefix:	expo_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	expo_LimitsOnUseOfAuthorizedCapitalStockLineItems
Namespace Prefix:	expo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration