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Pension Plans and Other Retirement Benefits - Additional Information (Detail) (USD $)
3 Months Ended
May 03, 2014
May 04, 2013
Pension Plans and Other Retirement Benefits [Line Items]    
Minimum percentage of pension liability 80.00%  
Anticipated employer's contribution to fund current benefit and expense payments under the unfunded plan in fiscal 2015 $ 3,400,000  
Amortization from other comprehensive income to net income 864,226 862,856
Post Retirement Medical Plan
   
Pension Plans and Other Retirement Benefits [Line Items]    
Estimated postretirement medical plan, long-term liability $ 1,200,000