Assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands	Jan. 29, 2021	Jan. 31, 2020
Liabilities:
Current and long-term obligations	$ 4,130,975	$ 2,911,993
Reported amount | Long-term obligations
Liabilities:
Long-term obligations	4,130,975
Reported amount | Accrued expenses and other current liabilities
Liabilities:
Deferred compensation	2,654
Reported amount | Noncurrent Other liabilities
Liabilities:
Deferred compensation	32,146
Fair value measurements on recurring basis | Balance at the end of the period
Liabilities:
Long-term obligations	4,706,259
Deferred compensation	34,800
Fair value measurements on recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Liabilities:
Long-term obligations	4,541,894
Deferred compensation	34,800
Fair value measurements on recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term obligations	$ 164,365