Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Oct. 31, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2014
Discontinued Operations:
Net sales			$ 83,903
Operating loss of discontinued operations	(435)		(3,433)
Pre-tax gain on disposal of discontinued business		(746)	7,825	7,079
Income (loss) before income taxes	(435)		4,392
Income tax benefit	(159)		(322)
Income (loss) from discontinued operations, net of taxes	$ (276)		$ 4,714