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Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Expected Amortization Expense [Line Items]    
Estimated annual amortization expense, For the fiscal year ending July 31, 2014 $ 10,192  
Estimated annual amortization expense, For the fiscal year ending July 31, 2015 9,844  
Estimated annual amortization expense, For the fiscal year ending July 31, 2016 8,802  
Estimated annual amortization expense, For the fiscal year ending July 31, 2017 8,595  
Estimated annual amortization expense, For the fiscal year ending July 31, 2018 8,157  
Estimated annual amortization expense, For the fiscal year ending July 31, 2019 and thereafter 52,163  
Estimated annual amortization expense, Total $ 97,753 $ 114,227