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Employee Retirement Plans	12 Months Ended
Employee Retirement Plans	Jan. 31, 2016
Employee Retirement Plans [Abstract]
Pension and Other Postretirement Benefits Disclosure	Employee Retirement Plans We have a 401(k) retirement plan covering substantially all of our United States employees. Under the plan, participating employees may defer up to 100% of their pre-tax earnings, subject to the Internal Revenue Service annual contribution limits. Effective January 2013, we began matching a portion of the employee contributions. Our contribution expense in fiscal years 2016, 2015 and 2014 was $8 million, $6 million and $5 million, respectively. We also have defined contribution retirement plans outside of the United States to which we contributed $21 million, $20 million and $16 million for fiscal years 2016, 2015 and 2014, respectively.