Estimated Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014
Expected Amortization Expense [Line Items]
Estimated annual amortization expense, For the fiscal year ending July 31, 2015		$ 14,452
Estimated annual amortization expense, For the fiscal year ending July 31, 2016		13,213
Estimated annual amortization expense, For the fiscal year ending July 31, 2017		12,399
Estimated annual amortization expense, For the fiscal year ending July 31, 2018		11,650
Estimated annual amortization expense, For the fiscal year ending July 31, 2019		10,661
Estimated annual amortization expense, For the fiscal year ending July 31, 2020		9,918
Estimated annual amortization expense, For the fiscal year ending July 31, 2021 and thereafter		47,490
Estimated annual amortization expense, Total	$ 116,094	$ 119,783