Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Discontinued Operations:
Net sales				$ 83,903
Operating loss of discontinued operations	(1,280)	(716)	(4,279)	(5,280)
Pre-tax gain on disposal of discontinued business				7,079
Income (loss) before income taxes	(1,280)	(716)	(4,279)	1,799
Income tax benefit	(573)	(713)	(1,677)	(1,886)
Income (loss) from discontinued operations, net of taxes	$ (707)	$ (3)	$ (2,602)	$ 3,685