Commitments and Contingencies (Detail) - Mattress Fabrics [Member] - Capital Addition Purchase Commitments [Member] - USD ($)		3 Months Ended	12 Months Ended
	May 16, 2016	Jul. 31, 2016	May 01, 2016	Aug. 02, 2015
Commitments and Contingencies Disclosure [Line Items]
Open purchase commitments		$ 10,500,000	$ 10,600,000	$ 2,600,000
Buildings and Improvements [Member]
Commitments and Contingencies Disclosure [Line Items]
Open purchase commitments		7,400,000	$ 9,300,000
Contractual obligation	$ 11,200,000	7,400,000
Payments on construction of the building	1,900,000	3,800,000
Contractual obligation due in fiscal 2017	4,300,000	2,400,000
Contractual obligation due in fiscal 2018	3,800,000	3,800,000
Contractual obligation due in fiscal 2019	$ 1,200,000	$ 1,200,000
Buildings and Improvements [Member] | London Interbank Offered Rate (LIBOR) [Member]
Commitments and Contingencies Disclosure [Line Items]
Percentage rate added to variable rate	2.25%
Variable interest rate	30 day LIBOR rate
Buildings and Improvements [Member] | Letter of Credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Letter of credit	$ 5,000,000
Unused fee calculated on letter of credit	0.10%