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Employee Benefit Plans - Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Effect of One Percentage Point Increase on Service and Interest Cost Components $ 14
Effect of One Percentage Point Decrease on Service and Interest Cost Components (14)
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 26
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (28)