Goodwill And Other Intangible Assets (Reconciliation Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Goodwill [Line Items]
Beginning Balance	$ 165,568	$ 162,949
Foreign exchange translation	838	2,619
Ending Balance	166,406	165,568
Engine Products [Member]
Goodwill [Line Items]
Beginning Balance	72,321	71,747
Foreign exchange translation	52	574
Ending Balance	72,373	72,321
Industrial Products [Member]
Goodwill [Line Items]
Beginning Balance	93,247	91,202
Foreign exchange translation	786	2,045
Ending Balance	$ 94,033	$ 93,247