Goodwill And Other Intangible Assets (Reconciliation Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2011
Goodwill [Line Items]
Balance as of July 31, 2011	$ 171,741
Foreign exchange translation	(2,797)
Balance as of October 31, 2011	168,944
Engine Products [Member]
Goodwill [Line Items]
Balance as of July 31, 2011	72,966
Foreign exchange translation	(286)
Balance as of October 31, 2011	72,680
Industrial Products [Member]
Goodwill [Line Items]
Balance as of July 31, 2011	98,775
Foreign exchange translation	(2,511)
Balance as of October 31, 2011	$ 96,264