Assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands	Oct. 30, 2020	Jan. 31, 2020
Liabilities:
Current and long-term obligations	$ 4,131,573	$ 2,911,993
Reported amount | Long-term obligations
Liabilities:
Current and long-term obligations	4,131,573
Reported amount | Accrued expenses and other current liabilities
Liabilities:
Deferred compensation	1,776
Reported amount | Noncurrent Other liabilities
Liabilities:
Deferred compensation	29,472
Fair value measurements on recurring basis | Balance at the end of the period
Liabilities:
Long-term obligations	4,691,222
Deferred compensation	31,248
Fair value measurements on recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Liabilities:
Long-term obligations	4,525,226
Deferred compensation	31,248
Fair value measurements on recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term obligations	$ 165,996