Customer Concentration - Additional Information (Detail) - USD ($)	12 Months Ended
May 31, 2016	May 31, 2015
Revenue, Major Customer [Line Items]
Net sales	$ 211,774,000	$ 186,985,000
Sun Home Services, Inc [Member]
Revenue, Major Customer [Line Items]
Net sales	$ 22,231,000	$ 20,187,000
Net sale Percentage	10.00%	11.00%
Customer concentration risk percentage description	During fiscal 2016, net sales of homes and park models to Sun Home Services, Inc. totaled approximately $22,231,000 or 10 percent of total net sales. During fiscal 2015, net sales to this customer totaled $20,187,000 or 11 percent of total net sales. No other individual customer in fiscal 2016 and 2015 had net sales greater than 10 percent of net total sales.

Revenue, Major Customer [Line Items]

$ 22,231,000

$ 20,187,000

Customer concentration risk percentage description

During fiscal 2016, net sales of homes and park models to Sun Home Services, Inc. totaled approximately $22,231,000 or 10 percent of total net sales. During fiscal 2015, net sales to this customer totaled $20,187,000 or 11 percent of total net sales. No other individual customer in fiscal 2016 and 2015 had net sales greater than 10 percent of net total sales.