Assets and liabilities measured at fair value (Details) $ in Thousands	Feb. 01, 2019 USD ($)
Reported amount | Current portion of long-term debt obligations
Liabilities:
Long-term obligations	$ 1,950
Reported amount | Long-term obligations
Liabilities:
Long-term obligations	2,862,740
Reported amount | Accrued expenses and other current liabilities
Liabilities:
Deferred compensation	2,043
Reported amount | Noncurrent Other liabilities
Liabilities:
Deferred compensation	22,853
Fair value measurements on recurring basis | Balance at the end of the period
Liabilities:
Long-term obligations	2,864,280
Deferred compensation	24,896
Fair value measurements on recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Liabilities:
Long-term obligations	2,480,044
Deferred compensation	24,896
Fair value measurements on recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term obligations	$ 384,236