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Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 31, 2010	Jul. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations, net	$ 10,467	$ 10,467
Gain on disposal of discontinued operations	924	924
Gain on disposal of discontinued operations, income tax provision		$ 505
Gain on disposal of discontinued operations, net of tax, per diluted share	$ 0.07	$ 0.07

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.