Debt - Interest expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2017	Jul. 29, 2016	Jul. 28, 2017	Jul. 29, 2016
Significant components of interest expense
Amortization of deferred financing costs and OID	$ 1,647	$ 1,638	$ 3,361	$ 2,940
Other interest expense	799	795	1,884	1,360
Interest expense	17,161	16,784	34,503	33,310
First Lien Term Loan Facility
Significant components of interest expense
Interest debt expense	6,978	6,907	13,789	14,136
ABL Facility
Significant components of interest expense
Interest debt expense	862	569	1,643	1,124
Senior Notes
Significant components of interest expense
Interest debt expense	$ 6,875	$ 6,875	$ 13,826	$ 13,750