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Investments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands | Jul. 31, 2016 | Jul. 31, 2015
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments under employees deferred compensation plan | $ 15,529 | $ 10,803
Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments under employees deferred compensation plan | $ 15,529 | $ 10,803

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