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Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2016
Jan. 28, 2017
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Defined Benefit Plan Disclosure [Line Items]          
Settlement charge     $ 31,173    
Expected rate of return on plan assets 6.50% 6.00%      
Rate of compensation increase 4.80% 3.80%      
Funded Plan          
Defined Benefit Plan Disclosure [Line Items]          
Service cost     45,440 $ 50,080 $ 40,481
Interest cost     56,094 51,710 49,522
Expected return on plan assets     (70,535) (78,042) (65,187)
Amortization of prior service cost     377 377  
Amortization of net actuarial loss     31,397 33,146 13,848
Settlement charge     31,173    
Total expense     93,946 57,271 38,664
Net (gain) loss     17,894 (19,731) 209,091
Amortization of net (loss)     (31,397) (33,146) (13,848)
Settlement charge     (31,173)    
Amortization of prior service cost     (377) (377)  
Plan amendment         3,067
Total recognized in other comprehensive income (loss)     (45,053) (53,254) 198,310
Total recognized in net periodic benefit cost and other comprehensive income (loss)     $ 48,893 $ 4,017 $ 236,974
Discount rate       4.00% 5.00%
Expected rate of return on plan assets       6.75% 7.00%
Rate of compensation increase     4.00% 4.00% 4.00%
Funded Plan | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate     3.80%    
Expected rate of return on plan assets     6.00%    
Funded Plan | Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate     4.80%    
Expected rate of return on plan assets     6.50%    
Unfunded Plan          
Defined Benefit Plan Disclosure [Line Items]          
Service cost     $ 1,835 $ 1,562 $ 1,398
Interest cost     3,391 3,033 3,001
Amortization of prior service cost         2
Amortization of net actuarial loss     3,349 3,958 2,146
Total expense     8,575 8,553 6,547
Net (gain) loss     740 3,806 19,552
Amortization of net (loss)     (3,349) (3,958) (2,146)
Amortization of prior service cost         (2)
Total recognized in other comprehensive income (loss)     (2,609) (152) 17,404
Total recognized in net periodic benefit cost and other comprehensive income (loss)     $ 5,966 $ 8,401 $ 23,951
Discount rate     4.20% 3.70% 4.80%
Rate of compensation increase     6.00% 6.00% 6.00%