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Customer Concentration - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2014 | May 31, 2013
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 57,701,000 | $ 38,772,000 | $ 46,263,000 | $ 48,994,000 | $ 48,832,000 | $ 36,986,000 | $ 41,836,000 | $ 49,920,000 | $ 191,730,000 | $ 177,574,000
Net sale Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Sun Home Services, Inc [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 19,657,000 |
Net sale Percentage |  |  |  |  |  |  |  |  | 10.00% |
Customer concentration risk percentage description |  |  |  |  |  |  |  |  | During fiscal 2014, net sales of homes and recreational vehicles to Sun Home Services, Inc. totaled approximately $19,657,000 or 10 percent of total net sales. No other individual customer in fiscal 2014 and 2013 had net sales greater than 10 percent of net total sales. |

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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