Assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 29, 2021
Liabilities:
Current and long-term obligations	$ 4,130,710	$ 4,130,975
Reported amount | Long-term obligations
Liabilities:
Current and long-term obligations	4,130,710
Reported amount | Accrued expenses and other current liabilities
Liabilities:
Deferred compensation	2,505
Reported amount | Noncurrent Other liabilities
Liabilities:
Deferred compensation	40,485
Fair value measurements on recurring basis | Balance at the end of the period
Liabilities:
Long-term obligations	4,540,117
Deferred compensation	42,990
Fair value measurements on recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Liabilities:
Long-term obligations	4,377,059
Deferred compensation	42,990
Fair value measurements on recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term obligations	$ 163,058