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Segment Reporting (Tables)
6 Months Ended
Jan. 31, 2012
Segment Reporting [Abstract]  
Summary Of Segment Detail
                           
    Engine
Products
  Industrial
Products
  Corporate &
Unallocated
  Total
Company
 
Three Months Ended January 31, 2012:                          
Net sales   $ 370,834   $ 210,049   $   $ 580,883  
Earnings before income taxes     48,418     30,597     (2,596 )   76,419  
                           
Three Months Ended January 31, 2011:                          
Net sales   $ 331,122   $ 205,983   $   $ 537,105  
Earnings before income taxes     44,203     29,127     (5,323 )   68,007  
                           
Six Months Ended January 31, 2012:                          
Net sales   $ 764,559   $ 424,619   $   $ 1,189,178  
Earnings before income taxes     108,296     64,896     (4,756 )   168,436  
Assets     861,191     506,618     313,580     1,681,389  
                           
Six Months Ended January 31, 2011:                          
Net sales   $ 664,891   $ 409,123   $   $ 1,074,014  
Earnings before income taxes     92,654     59,162     (11,852 )   139,964  
Assets     779,080     482,014     334,013     1,595,107