Debt (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 29, 2018 USD ($) $ / shares shares	Apr. 27, 2018 $ / shares	Jan. 28, 2018 USD ($)
Debt Instrument
Proceeds from issuance of debt	$ 1,980,000
Unamortized discount and issuance costs	(14,000)		$ (15,000)
Long-term debt, net carrying amount	1,986,000		1,985,000
Convertible Notes - Face Amount	$ 1,500,000
Stated interest rate, Convertible Notes	1.00%
Extinguishment of Debt, to date	$ 1,490,000
Repayment of Convertible Notes	2,000
Convertible short-term debt	$ 14,000		15,000
Shares issued - Convertible Notes | shares	74
Closing stock price | $ / shares		$ 226.33
If-converted value in excess of principal - Convertible Notes	$ 144,000
Conversion ratio - Convertible Notes	49.9261
Principal amount of Convertible Notes	$ 1
Conversion price - Convertible Notes | $ / shares	$ 20.0296
Note Hedges Strike Price | $ / shares	$ 20.0296
Shares received from Note Hedges | shares	56,000
Revolving Credit Facility [Member]
Debt Instrument
Line of Credit Facility, Current Borrowing Capacity	$ 575,000
Additional borrowing capacity from Revolving Credit Facility	425,000
Commercial Paper [Member]
Debt Instrument
Line of Credit Facility, Current Borrowing Capacity	575,000
2021 Notes [Member]
Debt Instrument
Long-term Debt, Gross	$ 1,000,000		1,000,000
Long-term Debt, Stated interest rate	2.20%
Expected remaining term - Long-term debt	3 years 4 months 24 days
Effective interest rate - Long-term debt	2.38%
2026 Notes [Member]
Debt Instrument
Long-term Debt, Gross	$ 1,000,000		$ 1,000,000
Long-term Debt, Stated interest rate	3.20%
Expected remaining term - Long-term debt	8 years 4 months 24 days
Effective interest rate - Long-term debt	3.31%