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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