Business Combination - Mattress Fabric Segment - Unaudited Pro Forma Consolidated Results of Operations (Detail) (Bodet And Horst [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 27, 2013	Oct. 28, 2012	Oct. 27, 2013	Oct. 28, 2012
Bodet And Horst [Member]
Business Acquisition [Line Items]
Net Sales	$ 70,589	$ 68,027	$ 140,730	$ 139,678
Income from operations	5,035	4,659	11,009	10,129
Net income	$ 3,096	$ 8,192	$ 6,326	$ 11,675
Net income per share, basic	$ 0.25	$ 0.67	$ 0.52	$ 0.94
Net income per share, diluted	$ 0.25	$ 0.66	$ 0.51	$ 0.93