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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets (Detail)
$ in Thousands
Jul. 31, 2015
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
Remainder of fiscal 2015 $ 34,126
2016 105,173
2017 68,229
2018 50,718
2019 27,945
2020 and thereafter 32,308
Total $ 318,499