Estimated Amortization Expense (Detail) $ in Thousands	Jul. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated annual amortization expense, For the fiscal year ending July 31, 2018	$ 53,968
Estimated annual amortization expense, For the fiscal year ending July 31, 2019	50,136
Estimated annual amortization expense, For the fiscal year ending July 31, 2020	46,269
Estimated annual amortization expense, For the fiscal year ending July 31, 2021	42,935
Estimated annual amortization expense, For the fiscal year ending July 31, 2022	37,828
Estimated annual amortization expense, For the fiscal year ending July 31, 2023 and thereafter	212,330
Estimated annual amortization expense, Total	$ 443,466