Loan Transactions and Related Notes Receivable - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Jul. 31, 2012 Freedomroads	Jul. 31, 2011 Freedomroads	Jul. 31, 2010 Freedomroads	Jan. 15, 2009 First Credit Agreement	Apr. 30, 2012 Second Credit Agreement	Jan. 30, 2009 Second Credit Agreement	Dec. 22, 2009 Third Credit Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan amount				$ 10,000		$ 10,000	$ 10,000
Note receivable maturity date				Jan. 15, 2014		Jun. 30, 2012	Dec. 22, 2014
Note receivable interest rate				12.00%		12.00%	12.00%
Notes receivable semi-annual installment, first payment						1,000	500
Notes receivable semi-annual installment, second payment						1,000	1,000
Notes receivable semi-annual installment, third payment						1,000	1,100
Notes receivable semi-annual installment, fourth payment						1,000	7,400
Notes receivable semi-annual installment, fifth payment						6,000
Final principal payment received					$ 6,000
FreedomRoads sales as percentage of recreation vehicle net sales	14.00%	14.00%	18.00%
FreedomRoads sales as percentage of consolidated net sales	12.00%	12.00%	15.00%