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Pension Plans and Other Retirement Benefits - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 30, 2016
Dec. 31, 2015
Jan. 31, 2015
Dec. 31, 2014
Feb. 01, 2014
Dec. 31, 2013
Pension Plans and Other Retirement Benefits [Line Items]              
Net accrued liability recognized in balance sheet   $ 178,100,000   $ 221,400,000      
Pension plans and other retirement benefits, current liability   3,200,000   3,500,000      
Pension plans and other retirement benefits, long-term liability   174,900,000   217,900,000      
Employer contribution   $ 55,700,000   151,300,000   $ 32,700,000  
Minimum percentage of pension liability   80.00%          
Anticipated employer's contribution to fund current benefit and expense payments under the unfunded plan in fiscal 2017   $ 3,300,000          
Percentage of employees contribution from eligible pay, maximum   50.00%          
Rate of eligible pay for matching employee contributions   5.00%          
Minimum range of rates for matching employee contributions   25.00%          
Maximum range of rates for matching employee contributions   75.00%          
Rate of defined pension plan   25.00%          
Percentage of plan investments representing stock funds     7.10%   7.40%   8.30%
Post retirement medical and life insurance benefits to retirees   Who are eligible for the defined benefit plan and who retired at age 55 or older with ten or more years of service.          
Multiemployer Pension Plans              
Pension Plans and Other Retirement Benefits [Line Items]              
Pension contribution to National Retirement Fund   $ 13,400,000   11,500,000   11,500,000  
Percentage of pension contribution         5.00%    
Retirement/Deferred Savings Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Employer contribution   9,700,000   9,300,000   8,100,000  
Funded Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Net accrued liability recognized in balance sheet   93,158,000   139,141,000      
Estimated amortization of net actuarial loss for 2017   28,500,000          
Estimated amortization of prior service cost for 2017   377,000          
Increase in projected benefit obligation       59,000,000      
Employer contribution   $ 50,000,000   150,000,000      
Excess percentage of projected benefit obligation for amortization of unrecognized gains and losses   10.00%          
Fair value of plan assets at end of year   $ 1,119,842,000   1,170,748,000   944,801,000  
Defined benefit plan, benefits paid   24,956,000   28,348,000      
Prior service cost   2,690,000   3,067,000      
Unfunded Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Net accrued liability recognized in balance sheet   84,967,000   82,238,000      
Estimated amortization of net actuarial loss for 2017   3,500,000          
Increase in projected benefit obligation       4,000,000      
Employer contribution   5,672,000   1,279,000      
Defined benefit plan, benefits paid   5,672,000   1,279,000      
Nonqualified Savings Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Employer contribution   $ 1,300,000   3,500,000   2,400,000  
Post Retirement Medical Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Minimum age of retirement   55 years          
Minimum years of employment to be eligible in post retirement medical plan   10 years          
Defined benefit plan, benefits paid   $ 161,000          
Postretirement liability   1,000,000          
Cost of benefit plan amendment   46,800,000          
Unamortized balance of plan   6,200,000          
Prior service cost   $ 3,500,000          
Post Retirement Medical Plan | Scenario Forecast              
Pension Plans and Other Retirement Benefits [Line Items]              
Pre-tax income from post retirement medical plan reflected in income statement $ 5,600,000            
401(k) Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Fair value of plan assets at end of year     $ 1,314,800,000   $ 1,275,400,000    
Deferral Rate              
Pension Plans and Other Retirement Benefits [Line Items]              
Rate of defined pension plan   2.00%          
Employee Savings Plan              
Pension Plans and Other Retirement Benefits [Line Items]              
Employer contribution   $ 30,800,000   $ 31,200,000   $ 29,700,000