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Stock-Based Compensation - Stock Option Assumptions (Detail) (USD $)
6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term 5 years 11 months 19 days 5 years 11 months 12 days
Expected volatility 37.32% 38.68%
Expected dividend yield 2.35% 2.20%
Risk-free interest rate 1.80% 0.90%
Weighted-average market value of underlying stock at grant date (USD per share) $ 30.98 $ 30.36
Weighted average exercise price (USD per share) $ 30.98 $ 30.36
Weighted-average fair value of options granted during the period (USD per share) $ 9.17 $ 9.01