Reconciliation of Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Loss from continuing operations	$ (12,106)	$ (9,478)	$ (13,440)	$ (7,877)
Income from discontinued operations				80
Net loss	$ (12,106)us-gaap_NetIncomeLoss	$ (9,478)us-gaap_NetIncomeLoss	$ (13,440)us-gaap_NetIncomeLoss	$ (7,797)us-gaap_NetIncomeLoss
Weighted average common shares outstanding	51,750	51,498	51,917	51,502
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	51,750	51,498	51,917	51,502
Basic net income (loss) per common share from:
Continuing operations	$ (0.23)	$ (0.18)	$ (0.26)	$ (0.15)
Discontinued operations	$ 0	$ 0	$ 0	$ 0
Basic net loss per common share	$ (0.23)us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.26)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per common share from:
Continuing operations	$ (0.23)	$ (0.18)	$ (0.26)	$ (0.15)
Discontinued operations	$ 0	$ 0	$ 0	$ 0
Diluted net loss per common share	$ (0.23)us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.26)us-gaap_EarningsPerShareDiluted	$ (0.15)us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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