Estimated Amortization Expense (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Expected Amortization Expense [Line Items]
Estimated annual amortization expense, For the fiscal year ending July 31, 2016	$ 23,440
Estimated annual amortization expense, For the fiscal year ending July 31, 2017	20,671
Estimated annual amortization expense, For the fiscal year ending July 31, 2018	18,986
Estimated annual amortization expense, For the fiscal year ending July 31, 2019	16,975
Estimated annual amortization expense, For the fiscal year ending July 31, 2020	15,256
Estimated annual amortization expense, For the fiscal year ending July 31, 2021 and thereafter	73,690
Estimated annual amortization expense, Total	$ 169,018	$ 119,783