Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Jul. 31, 2011
Segment Reporting Information [Line Items]          
Number of reportable segments     3    
Net Sales $ 926,458 $ 852,059 $ 2,196,428 $ 1,984,970  
Income (Loss) Before Income Taxes 61,219 57,318 117,363 98,485  
Identifiable Assets 1,242,954   1,242,954   1,198,070
Recreation Vehicle [Member]
          
Segment Reporting Information [Line Items]          
Net Sales 807,196 742,797 1,869,850 1,686,471  
Income (Loss) Before Income Taxes 59,162 60,035 115,970 105,164  
Identifiable Assets 888,915   888,915   789,645
Buses [Member]
          
Segment Reporting Information [Line Items]          
Net Sales 119,262 109,262 326,578 298,499  
Income (Loss) Before Income Taxes 2,828 4,472 10,693 17,683  
Identifiable Assets 139,400   139,400   126,224
Corporate [Member]
          
Segment Reporting Information [Line Items]          
Income (Loss) Before Income Taxes (771) (7,189) (9,300) (24,362)  
Identifiable Assets 214,639   214,639   282,201
Towables [Member] | Recreation Vehicle [Member]
          
Segment Reporting Information [Line Items]          
Net Sales 680,472 624,631 1,623,782 1,411,882  
Income (Loss) Before Income Taxes 51,050 54,131 104,810 96,039  
Identifiable Assets 780,638   780,638   696,059
Motorized [Member] | Recreation Vehicle [Member]
          
Segment Reporting Information [Line Items]          
Net Sales 126,724 118,166 246,068 274,589  
Income (Loss) Before Income Taxes 8,112 5,904 11,160 9,125  
Identifiable Assets $ 108,277   $ 108,277   $ 93,586