Debt (Details) - USD ($) $ in Thousands						1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Apr. 08, 2016	Aug. 24, 2015	Oct. 08, 2013	Apr. 04, 2012	Jan. 13, 2012	May 31, 2017	Apr. 29, 2016	Jul. 28, 2017	Jul. 29, 2016	Jan. 27, 2017	Dec. 29, 2011
Debt Instruments
Loss on extinguishment									$ 335
First Lien Term Loan Facility
Debt Instruments
Amount			$ 100,000		$ 525,000
Ownership percentage in subsidiary			100.00%		100.00%
Scheduled quarterly payments as a percentage of original principal amount			0.25%		0.25%
Refinancing costs				$ 11,200
Percentage of positive consolidated net income to determine a restricted payment under terms of debt instruments			50.00%
Percentage of negative consolidated net income to determine a restricted payment under terms of debt instruments			100.00%
Amount used to determine dividend and other payments			$ 20,000
Interest rate at the end of the period (as a percent)								4.75%
Amount outstanding								$ 590,300
Percentage of excess cash flow to be used for prepayment of debt										50.00%
Step down percentage one of excess cash flow to be used for prepayment of debt										25.00%
Stepdown percentage two of excess cash flow to be used for prepayment of debt (as a percent)										0.00%
Excess cash flow payment required										$ 0
Mandatory prepayments								50.00%
Term loan prepayment						$ 2,000
Scheduled quarterly payments			$ 1,535
First Lien Term Loan Facility | Prime Rate
Debt Instruments
Interest rate (as a percent)								4.25%
First Lien Term Loan Facility | Base Rate
Debt Instruments
Applicable margin (as a percent)			2.50%	3.00%	4.50%
First Lien Term Loan Facility | Federal Funds Effective Rate
Debt Instruments
Applicable margin (as a percent)								0.50%
First Lien Term Loan Facility | Eurocurrency rate (adjusted)
Debt Instruments
Applicable margin (as a percent)								1.00%
First Lien Term Loan Facility | Eurocurrency loan
Debt Instruments
Variable rate at the end of the period (as a percent)								1.25%
Applicable margin at the end of the period (as a percent)								3.50%
First Lien Term Loan Facility | LIBOR
Debt Instruments
Applicable margin (as a percent)			3.50%	4.00%	5.50%
Interest rate, variable interest rate floor (as a percent)			1.00%	1.25%	1.50%
ABL Facility
Debt Instruments
Maximum borrowing capacity	$ 160,000	$ 185,000			$ 175,000
Amount of increase (decrease) commitments available	(25,000)	10,000
Borrowing capacity available under certain circumstances	$ 25,000				$ 50,000
Commitment fee on unused commitments (as a percent)								0.50%
Amount outstanding								$ 51,300		39,300
Outstanding letters of credit								29,300		31,600
Amount available								$ 37,100		$ 37,200
Amendment fees		$ 500
Inventory advance rate (as a percent)		92.50%			90.00%
Maturity period prior to First Lien Term Loan Facility maturity date	90 days
Maturity period prior to Senior Notes maturity date	90 days
Minimum period after the maturity date of the credit facility that other refinanced debt obligations maturity date must exceed	180 days
Decrease in applicable margin upon refinancing of debt (as a percent)	0.50%
Maximum borrowing capacity of letters of credit	$ 45,000				$ 50,000
Loss on extinguishment							$ 300
Debt issuance cost							$ 4,700
ABL Facility | Base Rate
Debt Instruments
Applicable margin (as a percent)	2.00%
Applicable margin (as a percent)								2.25%
ABL Facility | Eurocurrency loan
Debt Instruments
Applicable margin (as a percent)	3.00%
ABL Facility | LIBOR
Debt Instruments
Applicable margin (as a percent)								3.25%
Senior Notes
Debt Instruments
Amount											$ 250,000
Interest rate (as a percent)											11.00%