Estimated Amortization Expense (Detail) $ in Thousands	Apr. 30, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated annual amortization expense, For the fiscal year ending July 31, 2019	$ 74,534
Estimated annual amortization expense, For the fiscal year ending July 31, 2020	89,556
Estimated annual amortization expense, For the fiscal year ending July 31, 2021	98,369
Estimated annual amortization expense, For the fiscal year ending July 31, 2022	104,684
Estimated annual amortization expense, For the fiscal year ending July 31, 2023	93,774
Estimated annual amortization expense, For the fiscal year ending July 31, 2024 and thereafter	589,294
Estimated annual amortization expense, Total	$ 1,050,211