Accrued Insurance Claims - Narratives (Details)	12 Months Ended
	Jan. 25, 2020 USD ($) state	Jan. 29, 2021 USD ($)	Jan. 26, 2019 USD ($)	Jan. 27, 2018 USD ($)	Jul. 29, 2017 USD ($)
Accrued Insurance Claims [Line Items]
Insurance coverage threshold	$ 5,000,000.0
Number of states with state-sponsored insurance fund | state	2
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment	$ 77,100,000		$ 78,900,000	$ 67,100,000	$ 103,700,000
Insurance liability, annual retained risk loss			400,000
Insurance Liability, Annual Retained Risk of Loss, Under Employee Health Plan Per Participant, Maximum Threshold	475,000		$ 425,000
Decrease in insurance recoveries/ receivable	8,800,000
Maximum
Accrued Insurance Claims [Line Items]
Insurance liability, annual retained risk loss	450,000
Losses below 5 million | Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability	1,000,000.0
Losses in excess of 5 million | Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability	5,000,000.0
Losses in excess of 10 million
Accrued Insurance Claims [Line Items]
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment	$ 10,000,000
Scenario, Forecast | Losses below 5 million
Accrued Insurance Claims [Line Items]
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment		$ 85,800,000
Scenario, Forecast | Losses below 5 million | Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability		1,000,000.0
Scenario, Forecast | Losses in excess of 5 million
Accrued Insurance Claims [Line Items]
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment		$ 11,500,000