Goodwill And Other Intangible Assets (Reconciliation Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Goodwill [Line Items]
Balance	$ 171,741	$ 165,315
Disposition activity		(325)
Foreign exchange translation	(8,792)	6,751
Balance	162,949	171,741
Engine Products [Member]
Goodwill [Line Items]
Balance	72,966	60,914
Goodwill transferred		11,258
Foreign exchange translation	(1,219)	794
Balance	71,747	72,966
Industrial Products [Member]
Goodwill [Line Items]
Balance	98,775	104,401
Goodwill transferred		(11,258)
Disposition activity		(325)
Foreign exchange translation	(7,573)	5,957
Balance	$ 91,202	$ 98,775