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Estimated Future Amortization Expense Related to Intangible Assets (Detail)
$ in Millions
Jul. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2016 $ 8.0
2017 7.2
2018 6.2
2019 5.0
2020 4.6
Thereafter 10.9
Finite-lived intangible assets $ 41.9