Goodwill And Other Intangible Assets (Reconciliation Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2012
Goodwill [Line Items]
Balance as of July 31, 2011	$ 171,741
Foreign exchange translation	(5,996)
Balance as of January 31, 2012	165,745
Engine Products [Member]
Goodwill [Line Items]
Balance as of July 31, 2011	72,966
Foreign exchange translation	(788)
Balance as of January 31, 2012	72,178
Industrial Products [Member]
Goodwill [Line Items]
Balance as of July 31, 2011	98,775
Foreign exchange translation	(5,208)
Balance as of January 31, 2012	$ 93,567