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Pension Plans and Other Retirement Benefits - Weighted Average Assumptions for Obligation (Detail)
Feb. 01, 2020
Feb. 02, 2019
Sep. 30, 2018
Funded Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.30% 4.30% 4.40%
Rate of compensation increase 4.00% 4.00%  
Unfunded Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.10% 4.10%  
Rate of compensation increase 4.00% 6.00%