Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Discontinued Operations:
Net sales	$ 83,903	$ 114,188
Operating income (loss) of discontinued operations	(3,433)	3,443
Pre-tax gain on disposal of discontinued business	7,825
Income before income taxes	4,392	3,443
Income tax expense (benefit)	(322)	1,204
Income from discontinued operations, net of taxes	$ 4,714	$ 2,239