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Goodwill And Other Intangible Assets (Schedule Of Change In Carrying Value In Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Apr. 30, 2012
Jul. 31, 2011
Apr. 30, 2012
Towables [Member]
Heartland [Member]
Segment Reporting Information [Line Items]      
Balance at July 31, 2011 $ 245,209 $ 244,452  
Adjustments to Heartland acquisition goodwill in towables reportable segment     757
Balance at April 30, 2012 $ 245,209 $ 244,452