Segment Reporting (Summary Of Segment Detail) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 624,234	$ 619,371	$ 1,805,240	$ 1,804,354
Earnings before income taxes	94,182	99,476	259,851	247,003
Assets	1,898,001	1,757,608	1,898,001	1,757,608	1,743,556
Engine Products [Member]
Segment Reporting Information [Line Items]
Net sales	402,157	383,314	1,160,948	1,107,814
Earnings before income taxes	61,432	65,680	170,799	152,129
Assets	890,639	815,604	890,639	815,604
Industrial Products [Member]
Segment Reporting Information [Line Items]
Net sales	222,077	236,057	644,292	696,540
Earnings before income taxes	32,507	37,555	91,682	102,709
Assets	552,533	539,151	552,533	539,151
Corporate & Unallocated [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes	243	(3,759)	(2,630)	(7,835)
Assets	$ 454,829	$ 402,853	$ 454,829	$ 402,853