Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (2,906)	$ (13,948)	$ (11,449)	$ (28,721)
Weighted average common shares outstanding	55,083	51,879	55,031	52,039
Weighted average common equivalent shares arising from dilutive stock options and restricted stock	0	0	0	0
Weighted average number of common and potential common shares	55,083	51,879	55,031	52,039
Basic and diluted net loss per share	$ (0.05)	$ (0.27)	$ (0.21)	$ (0.55)