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Estimated Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2014 | Jul. 31, 2013
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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 and thereafter | 57,408 |
Estimated annual amortization expense, Total | $ 119,783 | $ 97,753

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