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, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Reconciliation of benefit obligations:      
Interest cost $ (2,162) $ (2,108) $ (2,306)
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year 32,412    
Fair value of plan assets at end of year 33,695 32,412  
U.S. defined benefit pension plans
     
Reconciliation of benefit obligations:      
Benefit obligation at beginning of year 44,430 46,967  
Interest cost 2,162 2,108  
Actuarial (gain) loss 6,855 (2,311)  
Benefits paid (2,577) (2,334)  
Benefit obligation at end of year 50,870 44,430  
Reconciliation of plan assets:      
Fair value of plan assets at beginning of year 32,412 25,429  
Actual return on plan assets 2,911 2,890  
Company contributions 949 6,427  
Benefits paid from plan assets (2,577) (2,334)  
Fair value of plan assets at end of year 33,695 32,412  
Funded status of the plans (underfunded) $ (17,175) $ (12,018)