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Unaudited Pro Forma Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Oct. 31, 2015
USD ($)
$ / shares
Business Acquisition, Pro Forma Information [Line Items]  
Net sales | $ $ 1,426,564
Net income | $ $ 54,921
Basic earnings per common share | $ / shares $ 1.05
Diluted earnings per common share | $ / shares $ 1.05