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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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May 31, 2014 | May 31, 2013 | Dec. 31, 2012 Folder Express [Member] | Sep. 30, 2013 Folder Express [Member] | Sep. 27, 2013 Wisco and NIC [Member] | Dec. 31, 2012 Wisco and NIC [Member] Minimum [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Total purchase consideration |  |  |  | $ 14,607 | $ 47,250 |
Net sales | $ 141,186 | $ 138,466 | $ 20,000 |  |  | $ 40,000

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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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) -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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