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Other Assets - Additional Information (Detail)
$ in Millions
Jul. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense for remainder of fiscal 2015 $ 0.3
Amortization expense for the year 2016 1.2
Amortization expense for the year 2017 1.1
Amortization expense for the year 2018 1.1
Amortization expense for the year 2019 0.7
Total remaining amortization expense for the years 2020-2023 $ 0.2