Assets and liabilities measured at fair value (Details) $ in Thousands	Oct. 28, 2016 USD ($)
Reported amount | Current portion of long-term debt obligations
Liabilities:
Long-term obligations	$ 501,480
Reported amount | Long-term obligations
Liabilities:
Long-term obligations	2,673,210
Reported amount | Accrued expenses and other current liabilities
Liabilities:
Deferred compensation	5,210
Reported amount | Noncurrent Other liabilities
Liabilities:
Deferred compensation	17,490
Fair value measurements on recurring basis | Balance at the end of the period
Liabilities:
Long-term obligations	3,262,934
Deferred compensation	22,700
Fair value measurements on recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Liabilities:
Long-term obligations	2,369,552
Deferred compensation	22,700
Fair value measurements on recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term obligations	$ 893,382