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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended
	Oct. 31, 2011	Jul. 31, 2011	Oct. 31, 2011 Buses [Member]	Oct. 31, 2011 Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived assets, useful lives, years				25
Definite-lived assets, useful lives minimum, years				20
Definite-lived assets, useful lives maximum, years				25
Goodwill	$ 245,209	$ 244,452	$ 7,106
Indefinite-lived intangible assets impairment				$ 2,036

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