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Weighted-Average Assumptions Used to Determine Net Periodic Pension Cost (Detail)
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 1.69% 1.95% 3.05%
Expected long-term rate of return on plan assets 1.69% 2.41% 3.02%
Rate of compensation increase 1.91% 1.83% 2.41%