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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2018
Jul. 28, 2019
Apr. 28, 2019
Jul. 26, 2020
Jul. 28, 2019
Jan. 27, 2019
Jan. 26, 2020
Commitments and Contingencies [Line Items]              
Legal recoveries $ 9.0            
Restructuring expense   $ 2.0     $ 2.1    
Environmental Issue              
Commitments and Contingencies [Line Items]              
Loss contingency, estimate of probable loss       $ 1.3      
Aggregate payments towards remediation plan to date       5.1      
Minimum | Environmental Issue              
Commitments and Contingencies [Line Items]              
Loss contingency, estimate of probable loss       6.4      
Maximum | Environmental Issue              
Commitments and Contingencies [Line Items]              
Loss contingency, estimate of probable loss       8.0      
Other Assets              
Commitments and Contingencies [Line Items]              
Cash surrender value of life insurance       $ 24.1     $ 24.3
Selling, General and Administrative Expenses              
Commitments and Contingencies [Line Items]              
Legal recoveries     $ 1.0     $ 8.0