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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Financial Assets |  |
Cash equivalents | $ 445 | $ 114
Marketable securities | 1,809 | 2,153
Total Financial Assets | 2,254 | 2,267
Financial Liabilities |  |
Total Financial Liabilities | 67,976 | 75,571
Interest rate swap agreements [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 555 | 522
Contingent liability for acquisition earn out [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 67,421 | 75,049
Corporate bond securities [Member] |  |
Financial Assets |  |
Marketable securities |  | 303
U.S. government agency obligations [Member] |  |
Financial Assets |  |
Marketable securities | 1,809 | 1,850
Money market funds [Member] |  |
Financial Assets |  |
Cash equivalents | 445 | 114
Level 1 [Member] |  |
Financial Assets |  |
Cash equivalents | 445 | 114
Marketable securities | 0 | 0
Total Financial Assets | 445 | 114
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 1 [Member] | Interest rate swap agreements [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 1 [Member] | Contingent liability for acquisition earn out [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 1 [Member] | Corporate bond securities [Member] |  |
Financial Assets |  |
Marketable securities |  | 0
Level 1 [Member] | U.S. government agency obligations [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Level 1 [Member] | Money market funds [Member] |  |
Financial Assets |  |
Cash equivalents | 445 | 114
Level 2 [Member] |  |
Financial Assets |  |
Cash equivalents | 0 | 0
Marketable securities | 0 | 303
Total Financial Assets | 0 | 303
Financial Liabilities |  |
Total Financial Liabilities | 555 | 522
Level 2 [Member] | Interest rate swap agreements [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 555 | 522
Level 2 [Member] | Contingent liability for acquisition earn out [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 2 [Member] | Corporate bond securities [Member] |  |
Financial Assets |  |
Marketable securities |  | 303
Level 2 [Member] | U.S. government agency obligations [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Level 2 [Member] | Money market funds [Member] |  |
Financial Assets |  |
Cash equivalents | 0 | 0
Level 3 [Member] |  |
Financial Assets |  |
Cash equivalents | 0 | 0
Marketable securities | 1,809 | 1,850
Total Financial Assets | 1,809 | 1,850
Financial Liabilities |  |
Total Financial Liabilities | 67,421 | 75,049
Level 3 [Member] | Interest rate swap agreements [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 3 [Member] | Contingent liability for acquisition earn out [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 67,421 | 75,049
Level 3 [Member] | Corporate bond securities [Member] |  |
Financial Assets |  |
Marketable securities |  | 0
Level 3 [Member] | U.S. government agency obligations [Member] |  |
Financial Assets |  |
Marketable securities | 1,809 | 1,850
Level 3 [Member] | Money market funds [Member] |  |
Financial Assets |  |
Cash equivalents | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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