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Summary of Financial Information by Reportable Segment and Product Line (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Segment Reporting Information [Line Items]      
Net sales $ 377,248 $ 392,799  
Operating profit (Loss) 51,302 57,281  
Assets 2,025,456   2,007,119
Industrial
      
Segment Reporting Information [Line Items]      
Net sales 101,122 100,253  
Operating profit (Loss) 27,006 27,934  
Assets 271,607   268,735
Energy
      
Segment Reporting Information [Line Items]      
Net sales 90,769 80,421  
Operating profit (Loss) 15,387 13,217  
Assets 545,760   540,409
Electrical
      
Segment Reporting Information [Line Items]      
Net sales 69,439 82,833  
Operating profit (Loss) 7,828 4,977  
Assets 444,780   437,914
Engineered Solutions
      
Segment Reporting Information [Line Items]      
Net sales 115,918 129,292  
Operating profit (Loss) 7,625 18,999  
Assets 671,372   667,550
General Corporate
      
Segment Reporting Information [Line Items]      
Operating profit (Loss) (6,544) (7,846)  
Assets 91,937   92,511
Vehicle Systems
      
Segment Reporting Information [Line Items]      
Net sales 61,187 76,363  
Other
      
Segment Reporting Information [Line Items]      
Net sales $ 54,731 $ 52,929