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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012 | May 29, 2014 | Feb. 15, 2013 | Feb. 09, 2012 | May 23, 2006
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  |
Preferred Stock Shares Authorized Limitation On Use |  |  |  |  |  |  |  | 2,000,000 expo_PreferredStockSharesAuthorizedLimitationOnUse
Preferred Stock Shares Issued |  | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 0 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 35,078,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 27, 2015 |  |  |  |  |  |  |
Dividends Payable, Date of Record | Mar. 06, 2015 |  |  |  |  |  |  |
Dividends Payable, Date Declared | Feb. 04, 2015 |  |  |  |  |  |  |
Net losses related to the re-issuance of treasury stock |  | 6,050,000 us-gaap_TreasuryStockReissuedAtLowerThanRepurchasePrice | 10,383,000 us-gaap_TreasuryStockReissuedAtLowerThanRepurchasePrice | 10,600,000 us-gaap_TreasuryStockReissuedAtLowerThanRepurchasePrice |  |  |  |
Purchase of treasury shares (in shares) |  | 425,000 us-gaap_TreasuryStockSharesAcquired | 438,000 us-gaap_TreasuryStockSharesAcquired | 480,000 us-gaap_TreasuryStockSharesAcquired |  |  |  |
Purchase of treasury shares |  | (30,921,000)us-gaap_TreasuryStockValueAcquiredCostMethod | (25,011,000)us-gaap_TreasuryStockValueAcquiredCostMethod | (23,395,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 35,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 35,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 35,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |

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