Annual report pursuant to Section 13 and 15(d)

Changes in Projected Benefit Obligations, Fair Value of Plan Assets and Funded Status of Defined Benefit Pension Plans (Detail)

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Changes in Projected Benefit Obligations, Fair Value of Plan Assets and Funded Status of Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year $ 39,181    
Fair value of plan assets at end of year 39,489 $ 39,181  
United States Pension Plan of US Entity      
Reconciliation of benefit obligations:      
Benefit obligation at beginning of year 45,612 47,545  
Interest cost 1,970 1,920 $ 2,146
Defined Benefit Plan, Actuarial Gain (Loss) 5,604 (170)  
Defined Benefit Plan, Benefits Paid (2,777) (3,683)  
Benefit obligation at end of year 50,409 45,612 47,545
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year 39,181 44,642  
Defined Benefit Plan, Actual Return on Plan Assets 2,687 (2,088)  
Defined Benefit Plan, Contributions by Employer 398 310  
Benefits paid from plan assets (2,777) (3,683)  
Fair value of plan assets at end of year 39,489 39,181 $ 44,642
Funded status of the plans (underfunded) (10,920) (6,431)  
Fair Value, Inputs, Level 2 | Fixed Income Securities      
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year 12,581    
Fair value of plan assets at end of year $ 11,723 $ 12,581