Leases - Lease Cost and Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 24, 2020	Oct. 26, 2019	Oct. 24, 2020	Oct. 26, 2019	Jan. 25, 2020
Leases [Abstract]
Lease cost under long-term operating leases	$ 8,804	$ 8,388	$ 17,691	$ 25,095
Lease cost under short-term operating leases	6,624	8,641	21,740	25,662
Variable lease cost under short-term and long-term operating leases	743	933	12,499	3,182
Total lease cost	$ 16,171	$ 17,962	$ 51,930	$ 53,939
Operating Lease, Weighted Average Remaining Lease Term	3 years 3 months 18 days		3 years 3 months 18 days		3 years 3 months 18 days
Weighted average discount rate (percent)	4.90%		4.90%		5.20%