Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.3.0.814
Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Expense on participant deferrals in fixed income investment option $ 1,800 $ 1,700 $ 1,600
Cost of stock held in trust for deferred compensation plan 3,700 2,900  
Other Current Liabilities and Other Long-term Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Deferred compensation liability 22,700 22,800  
United States Pension Plan of US Entity      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan actuarial gain losses, not yet recognized in net periodic benefit cost (15,200) (12,600)  
Pension plan actuarial gain losses, expected to be recognized in net periodic benefit cost in 2015 $ 500    
Expected long term rate of return for assets 7.40%    
Amount of benefits expected to be paid in fiscal 2016 $ 2,800    
Amount of benefits expected to be paid in fiscal 2017 2,800    
Amount of benefits expected to be paid in fiscal 2018 2,800    
Amount of benefits expected to be paid in, fiscal 2019 2,800    
Amount of benefits expected to be paid in, fiscal 2020 2,800    
Amount of benefits expected to be paid fiscal 2021 through fiscal 2025 15,000    
Net periodic benefit costs (credit) $ 395 $ 146 $ (338)
Weighted average discount rate for determining benefit obligation 4.45% 4.15% 4.90%
Benefit obligation $ 45,612 $ 47,545 $ 45,046
Other Postretirement Benefit Plan, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit costs (credit) 100 146 146
Define benefit plan Company contributions, year 2016 300    
Benefit obligation $ 3,500 3,100  
Health care cost trend rate 7.80%    
Health care cost trending downward rate by 2022 5.00%    
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Asset allocation in equity securities minimum 60.00%    
Asset allocation in equity securities maximum 80.00%    
Non-US Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Expected long term rate of return for assets 3.90%    
Net periodic benefit costs (credit) $ (1,000) $ (1,300) (800)
Weighted average discount rate for determining benefit obligation 3.10% 3.20%  
Define benefit plan Company contributions, year 2016 $ 400    
Benefit obligation $ 14,255 $ 18,599  
401(k)      
Defined Benefit Plan Disclosure [Line Items]      
Maximum employee contribution to defined contribution benefit plans 50.00%    
Maximum Company contribution to defined contribution benefit plans 3.00%    
Employer matching contribution to employee contribution percentage 25.00%    
Employee contribution percentage of eligible compensation 6.00%    
Expense recognized related to defined contribution plan $ 4,300 4,500 4,500
Supplemental Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation 2,000    
Expense recognized related to defined contribution plan $ 300 $ 400 $ 600
Supplemental Executive Retirement Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to defined contribution benefit plans 3.00%    
Supplemental Executive Retirement Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to defined contribution benefit plans 6.00%