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Summary of Significant Accounting Policies - Additional Information (Detail) In Millions, unless otherwise specified | May 23, 2006
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Summary Of Significant Accounting Policies [Line Items] |
Authorized Common Stock Shares Limits On Use | 40 expo_AuthorizedCommonStockSharesLimitsOnUse
Authorized Preferred Stock Shares Limits On Use | 2 expo_AuthorizedPreferredStockSharesLimitsOnUse

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- Definition Authorized Common Stock Shares Limits on Use. + References No definition available. + Details
Name: | expo_AuthorizedCommonStockSharesLimitsOnUse
Namespace Prefix: | expo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Authorized Preferred Stock Shares Limits on Use. + References No definition available. + Details
Name: | expo_AuthorizedPreferredStockSharesLimitsOnUse
Namespace Prefix: | expo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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