Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (12,849)	$ (12,106)	$ (41,570)	$ (13,440)
Weighted average common shares outstanding	52,200	51,750	51,867	51,917
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	52,200	51,750	51,867	51,917
Basic net loss per share	$ (0.25)	$ (0.23)	$ (0.80)	$ (0.26)
Diluted net loss per share	$ (0.25)	$ (0.23)	$ (0.80)	$ (0.26)