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, 2015
Aug. 31, 2014
Aug. 31, 2013
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year $ 44,642    
Fair value of plan assets at end of year 39,181 $ 44,642  
United States Pension Plan of US Entity      
Reconciliation of benefit obligations:      
Benefit obligation at beginning of year 47,545 45,046  
Interest cost 1,920 2,146 $ 1,928
Actuarial (gain) loss (170) 3,769  
Benefits paid (3,683) (3,416)  
Benefit obligation at end of year 45,612 47,545 45,046
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year 44,642 34,054  
Actual return on plan assets (2,088) 5,180  
Company contributions 310 8,824  
Benefits paid from plan assets (3,683) (3,416)  
Fair value of plan assets at end of year 39,181 44,642 $ 34,054
Funded status of the plans (underfunded) $ (6,431) $ (2,903)