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Employee Retirement Plans	12 Months Ended
Employee Retirement Plans	Jan. 27, 2019
Retirement Benefits [Abstract]
Employee Retirement Plans	Employee Retirement Plans We have a 401(k) retirement plan covering substantially all of our U.S. employees. Under the plan, participating employees may defer up to 80% of their pre-tax earnings, subject to the Internal Revenue Service annual contribution limits and we match a portion of the employee contributions. Our contribution expense for fiscal years 2019, 2018, and 2017 was $39 million, $23 million, and $12 million, respectively. We also have defined contribution retirement plans outside of the United States to which we contributed $31 million, $25 million, and $23 million for fiscal years 2019, 2018, and 2017, respectively.