Reconciliation of Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Income (loss) from continuing operations	$ 1,063	$ (12,417)	$ 1,601	$ (22,248)
Income (loss) from discontinued operations	1	(133)	80	(960)
Net income (loss)	$ 1,064	$ (12,550)	$ 1,681	$ (23,208)
Weighted average common shares outstanding	51,498	43,654	51,467	43,629
Weighted average common equivalent shares arising from dilutive stock options and restrictive stock	313		72
Weighted average number of common and potential common shares	51,811	43,654	51,539	43,629
Basic net income (loss) per common share from:
Continuing operations	$ 0.02	$ (0.29)	$ 0.03	$ (0.51)
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.02)
Basic net loss per common share	$ 0.02	$ (0.29)	$ 0.03	$ (0.53)
Diluted net income (loss) per common share from:
Continuing operations	$ 0.02	$ (0.29)	$ 0.03	$ (0.51)
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.02)
Diluted net loss per common share	$ 0.02	$ (0.29)	$ 0.03	$ (0.53)