Segment Reporting (Summary Of Segment Detail) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 599,384	$ 588,947
Earnings before income taxes	90,787	76,678
Assets	1,819,925	1,712,498	1,743,556
Engine Products [Member]
Segment Reporting Information [Line Items]
Net sales	389,116	370,660
Earnings before income taxes	62,073	47,424
Assets	864,273	818,480
Industrial Products [Member]
Segment Reporting Information [Line Items]
Net sales	210,268	218,287
Earnings before income taxes	31,143	32,562
Assets	526,142	539,894
Corporate & Unallocated [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes	(2,429)	(3,308)
Assets	$ 429,510	$ 354,124