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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets (Detail)
$ in Thousands
Apr. 30, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
Remainder of fiscal 2016 $ 61,299
2017 94,184
2018 68,496
2019 44,920
2020 30,861
2021 and thereafter 20,316
Total $ 320,076