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Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net sales | $ 83,903 | $ 448,385 | $ 444,862
Operating income (loss) of discontinued operations | (5,735) | 12,080 | 15,303
Pre-tax gain on disposal of discontinued business | 7,079 |  |
Impairment charges |  | 11,525 |
Income before income taxes | 1,344 | 555 | 15,303
Income tax benefit (expense) | 2,142 | 631 | (4,999)
Income from discontinued operations, net of taxes | $ 3,486 | $ 1,186 | $ 10,304

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