Estimated Amortization Expense (Detail) $ in Thousands	Jul. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated annual amortization expense, For the fiscal year ending July 31, 2019	$ 50,043
Estimated annual amortization expense, For the fiscal year ending July 31, 2020	46,194
Estimated annual amortization expense, For the fiscal year ending July 31, 2021	42,860
Estimated annual amortization expense, For the fiscal year ending July 31, 2022	37,753
Estimated annual amortization expense, For the fiscal year ending July 31, 2023	30,291
Estimated annual amortization expense, For the fiscal year ending July 31, 2024 and thereafter	181,207
Estimated annual amortization expense, Total	$ 388,348