Estimated Amortization Expense (Detail) $ in Thousands	Jul. 31, 2015 USD ($)
Expected Amortization Expense [Line Items]
Estimated annual amortization expense, For the fiscal year ending July 31, 2016	$ 23,442
Estimated annual amortization expense, For the fiscal year ending July 31, 2017	20,676
Estimated annual amortization expense, For the fiscal year ending July 31, 2018	18,991
Estimated annual amortization expense, For the fiscal year ending July 31, 2019	16,980
Estimated annual amortization expense, For the fiscal year ending July 31, 2020	15,261
Estimated annual amortization expense, For the fiscal year ending July 31, 2021 and thereafter	73,703
Estimated annual amortization expense, Total	$ 169,053