Schedule Of Estimated Annual Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012
Expected Amortization Expense [Line Items]
Estimated annual amortization expense, For the fiscal year ending July 31, 2013	$ 11,075
Estimated annual amortization expense, For the fiscal year ending July 31, 2014	10,833
Estimated annual amortization expense, For the fiscal year ending July 31, 2015	10,474
Estimated annual amortization expense, For the fiscal year ending July 31, 2016	9,419
Estimated annual amortization expense, For the fiscal year ending July 31, 2017	9,032
Estimated annual amortization expense, For the fiscal year ending July 31, 2018 and thereafter	$ 65,295