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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | Oct. 22, 2014 | May 23, 2006
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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 |

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- Definition Authorized common stock shares limits on use. + References No definition available. + Details
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Balance Type: | na
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- Definition Authorized preferred stock shares limits on use. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate dividends declared for each share of common stock outstanding on date subsequent to period end date. + References No definition available. + Details
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Namespace Prefix: | expo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | expo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration