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Concentration of Risk - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Two dealers | Bus |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of sales attributable to dealer | 28.00% | 26.00% | 17.00%
FreedomRoads, LLC |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of sales attributable to dealer | 12.00% | 12.00% | 15.00%
Percentage of accounts receivable attributable to one dealer | 20.00% | 14.00% |
FreedomRoads, LLC | Recreation Vehicles |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of sales attributable to dealer | 14.00% | 14.00% | 18.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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