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Estimated Future Amortization Expenses Related to Intangible Assets (Detail) - USD ($)
$ in Millions
Jul. 31, 2016
Jul. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
2017 $ 7.9  
2018 6.9  
2019 5.7  
2020 5.3  
2021 4.8  
Thereafter 7.0  
Net $ 37.6 $ 41.9