Goodwill and Intangible Assets - Impairment Analysis (Details)	Jan. 25, 2020	Jan. 26, 2019	Jan. 27, 2018	Jul. 29, 2017
Terminal Growth Rate
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Asset, Measurement Input	0.030
Discount Rate
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Asset, Measurement Input	0.100	0.110	0.110	0.110
Maximum | Terminal Growth Rate
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Asset, Measurement Input		0.030	0.030	0.030
Minimum | Terminal Growth Rate
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Asset, Measurement Input		0.025	0.025	0.020