Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Discontinued Operations:
Net sales		$ 104,995	$ 83,903	$ 219,183
Operating income (loss) of discontinued operations	(1,131)	1,073	(4,564)	4,516
Pre-tax gain (loss) on disposal of discontinued business	(746)		7,079
Income (loss) before income taxes	(1,877)	1,073	2,515	4,516
Income tax expense (benefit)	(851)	196	(1,173)	1,400
Income (loss) from discontinued operations, net of taxes	$ (1,026)	$ 877	$ 3,688	$ 3,116