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Earnings Per Share and Shareholders Equity - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
May 01, 2015
May 02, 2014
May 01, 2015
Oct. 31, 2014
Mar. 31, 2015
Jun. 19, 2014
Earnings Per Share And Shareholders Equity [Line Items]            
Anti-dilutive shares excluded from computation of earnings per share 243,450us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 177,100us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount        
Preferred stock shares authorized 25,000us-gaap_PreferredStockSharesAuthorized   25,000us-gaap_PreferredStockSharesAuthorized      
Preferred stock, par value $ 100us-gaap_PreferredStockParOrStatedValuePerShare   $ 100us-gaap_PreferredStockParOrStatedValuePerShare      
Common stock, shares authorized 60,000,000us-gaap_CommonStockSharesAuthorized   60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized    
Common stock, par value $ 0.20us-gaap_CommonStockParOrStatedValuePerShare   $ 0.20us-gaap_CommonStockParOrStatedValuePerShare $ 0.20us-gaap_CommonStockParOrStatedValuePerShare    
Preferred stock shares outstanding 0us-gaap_PreferredStockSharesOutstanding   0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding    
Approved and authorized amount under the stock repurchase program           $ 400,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Additional approved and authorized amount under the stock repurchase program         200,000,000esl_AdditionalStockRepurchaseProgramAuthorizedAmount  
Stock repurchased during period, shares     1,162,436us-gaap_TreasuryStockSharesAcquired 269,228us-gaap_TreasuryStockSharesAcquired    
Treasury Stock Acquired, Average Cost Per Share     $ 109.55us-gaap_TreasuryStockAcquiredAverageCostPerShare      
Aggregate value of repurchased stock     $ 127,300,000us-gaap_StockRepurchasedDuringPeriodValue      
Series B Preferred Stock            
Earnings Per Share And Shareholders Equity [Line Items]            
Preferred stock shares authorized 475,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
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  475,000us-gaap_PreferredStockSharesAuthorized
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Preferred stock, par value $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
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  $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
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Preferred stock shares outstanding 0us-gaap_PreferredStockSharesOutstanding
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  0us-gaap_PreferredStockSharesOutstanding
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0us-gaap_PreferredStockSharesOutstanding
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