Estimated Annual Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014
Expected Amortization Expense [Line Items]
Estimated annual amortization expense, For the fiscal year ending July 31, 2014	$ 12,267
Estimated annual amortization expense, For the fiscal year ending July 31, 2015	12,102
Estimated annual amortization expense, For the fiscal year ending July 31, 2016	10,760
Estimated annual amortization expense, For the fiscal year ending July 31, 2017	10,314
Estimated annual amortization expense, For the fiscal year ending July 31, 2018	9,687
Estimated annual amortization expense, For the fiscal year ending July 31, 2019 and thereafter	58,003
Estimated annual amortization expense, Total	$ 113,133