Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012		Jan. 31, 2013	Jan. 31, 2012
BASIC
Loss from continuing operations	$ (12,417)	$ (12,341)	[1]	$ (22,248)	$ (9,798)	[1]
Loss from discontinued operations	(133)	(535)	[1]	(960)	(1,933)	[1]
Net loss available for basic common shares	(12,550)	(12,876)		(23,208)	(11,731)
Weighted average common shares outstanding	43,654	43,434	[1]	43,629	43,367	[1]
Basic net loss per common share from continuing operations	$ (0.29)	$ (0.29)		$ (0.51)	$ (0.23)
Basic net loss per common share from discontinued operations		$ (0.01)		$ (0.02)	$ (0.04)
Earnings Per Share, Basic, Total	$ (0.29)	$ (0.30)		$ (0.53)	$ (0.27)
DILUTED
Loss from continuing operations	(12,417)	(12,341)	[1]	(22,248)	(9,798)	[1]
Loss from discontinued operations	(133)	(535)	[1]	(960)	(1,933)	[1]
Net loss available for diluted common shares	$ (12,550)	$ (12,876)		$ (23,208)	$ (11,731)
Weighted average common shares outstanding	43,654	43,434	[1]	43,629	43,367	[1]
Weighted average common equivalent shares arising from dilutive stock options
Weighted average number of common and potential common shares	43,654	43,434		43,629	43,367
Diluted net loss per common share from continuing operations	$ (0.29)	$ (0.29)		$ (0.51)	$ (0.23)
Diluted net loss per common share from discontinued operations		$ (0.01)		$ (0.02)	$ (0.04)
Earnings Per Share, Diluted, Total	$ (0.29)	$ (0.30)		$ (0.53)	$ (0.27)

[1] As Restated