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Segment Reporting (Tables)
3 Months Ended
Oct. 31, 2012
Segment Reporting [Abstract]  
Summary Of Segment Detail
    Engine
Products
    Industrial
Products
    Corporate & Unallocated     Total
Company
 
Three Months Ended October 31, 2012:                                
Net sales   $ 370,660     $ 218,287     $     $ 588,947  
Earnings before income taxes     47,424       32,562       (3,308 )     76,678  
Assets     818,480       539,894       354,124       1,712,498  
                                 
Three Months Ended October 31, 2011:                                
Net sales   $ 393,725     $ 214,570     $     $ 608,295  
Earnings before income taxes     59,878       34,299       (2,160 )     92,017  
Assets     882,967       521,984       341,220       1,746,171