Commitments and Contingencies - Additional Information (Detail) (USD $)			3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2014	May 31, 2014	May 31, 2014 Recreational Vehicles [Member] Vehicle	May 31, 2013 Recreational Vehicles [Member]	Aug. 31, 2014 Minimum [Member]	May 31, 2014 Minimum [Member]	Aug. 31, 2014 Maximum [Member]	May 31, 2014 Maximum [Member]
Loss Contingencies [Line Items]
Period to potentially repurchase units					12 months	12 months	24 months	24 months
Maximum potential repurchase liability	$ 62,000,000	$ 63,000,000
Other accrued liabilities	100,000	100,000
Recreational vehicles were repurchased			11
Recreational vehicles were repurchased for approximately			203,000
Losses from repurchased units			43,000	0
Obligations from repurchased units				$ 0