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Future Minimum Lease Payments (Detail)
$ in Millions
Jul. 31, 2015
USD ($)
Operating Leased Assets [Line Items]  
2016 $ 2.5
2017 1.9
2018 1.2
2019 0.9
2020 0.6
Thereafter 0.1
Operating Leases, Future Minimum Payments Due, Total $ 7.2