Segment Reporting (Summary Of Segment Detail) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Jul. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 596,510	$ 599,384
Earnings before income taxes	77,283	90,787
Assets	1,869,998	1,819,925	1,942,411
Engine Products [Member]
Segment Reporting Information [Line Items]
Net sales	390,720	389,116
Earnings before income taxes	53,160	62,073
Assets	896,090	864,273
Industrial Products [Member]
Segment Reporting Information [Line Items]
Net sales	205,790	210,268
Earnings before income taxes	27,643	31,143
Assets	644,755	526,142
Corporate & Unallocated [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes	(3,520)	(2,429)
Assets	$ 329,153	$ 429,510