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Pension Plans and Other Retirement Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2016
Nov. 03, 2018
Jan. 28, 2017
Feb. 02, 2019
Jan. 28, 2017
Sep. 30, 2018
Sep. 30, 2016
Nov. 03, 2018
Feb. 02, 2019
Feb. 03, 2018
Jan. 28, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]                        
Settlement charge       $ 31,173           $ 36,122 $ 0 $ 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, Net Periodic Benefit Cost (Credit) [Abstract]                        
Service cost                   45,342 $ 46,845 45,440
Interest cost                   54,355 55,301 56,094
Expected return on plan assets                   (79,190) (69,345) (70,535)
Amortization of prior service cost                   377 377 377
Amortization of net actuarial loss                   12,250 21,557 31,397
Settlement charge     $ 36,122             36,122 0 31,173
Total expense                   69,256 54,735 93,946
Net (gain) loss                   68,770 (38,293) 17,894
Amortization of net (loss)                   (12,250) (21,557) (31,397)
Settlement charge                   (36,122) 0 (31,173)
Amortization of prior service cost                   (377) (377) (377)
Total recognized in other comprehensive income (loss)                   20,021 (60,227) (45,053)
Total recognized in net periodic benefit cost and other comprehensive income (loss)                   $ 89,277 $ (5,492) $ 48,893
Discount rate         4.40% 3.80% 4.00% 4.80%     4.40%  
Expected rate of return on plan assets 6.00%       6.00% 6.00% 6.00% 6.50% 6.00%   6.00%  
Rate of compensation increase                   4.00% 4.00% 4.00%
Unfunded Plan                        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]                        
Service cost                   $ 2,391 $ 1,888 $ 1,835
Interest cost                   3,600 3,316 3,391
Amortization of net actuarial loss                   3,409 2,852 3,349
Total expense                   9,400 8,056 8,575
Net (gain) loss                   5,955 4,580 740
Amortization of net (loss)                   (3,409) (2,852) (3,349)
Total recognized in other comprehensive income (loss)                   2,546 1,728 (2,609)
Total recognized in net periodic benefit cost and other comprehensive income (loss)                   $ 11,946 $ 9,784 $ 5,966
Discount rate                   3.80% 4.00% 4.20%
Rate of compensation increase                   6.00% 6.00% 6.00%