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Fair Value - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Detail) - USD ($) $ in Thousands | Nov. 30, 2015 | May. 31, 2015
--- | --- | ---
Recurring [Member] |  |
Financial Assets |  |
Marketable securities | $ 1,639 | $ 1,689
Total Financial Assets | 1,639 | 1,689
Financial Liabilities |  |
Total Financial Liabilities | 37,946 | 47,641
Recurring [Member] | U.S. Government Agency Obligations [Member] |  |
Financial Assets |  |
Marketable securities | 1,639 | 1,689
Interest Rate Swap Agreements [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 97 | 257
Contingent Consideration Earn Out Liability [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 37,849 |
Contingent Consideration Earn Out Liability [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities |  | 47,384
Level 1 [Member] | Recurring [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Total Financial Assets | 0 | 0
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 1 [Member] | Recurring [Member] | U.S. Government Agency Obligations [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Level 1 [Member] | Interest Rate Swap Agreements [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 1 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 |
Level 2 [Member] | Recurring [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Total Financial Assets | 0 | 0
Financial Liabilities |  |
Total Financial Liabilities | 97 | 257
Level 2 [Member] | Recurring [Member] | U.S. Government Agency Obligations [Member] |  |
Financial Assets |  |
Marketable securities | 0 | 0
Level 2 [Member] | Interest Rate Swap Agreements [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 97 | 257
Level 2 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 |
Level 3 [Member] | Recurring [Member] |  |
Financial Assets |  |
Marketable securities | 1,639 | 1,689
Total Financial Assets | 1,639 | 1,689
Financial Liabilities |  |
Total Financial Liabilities | 37,849 | 47,384
Level 3 [Member] | Recurring [Member] | U.S. Government Agency Obligations [Member] |  |
Financial Assets |  |
Marketable securities | 1,639 | 1,689
Level 3 [Member] | Interest Rate Swap Agreements [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | 0 | 0
Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member] |  |
Financial Liabilities |  |
Total Financial Liabilities | $ 37,849 | $ 47,384

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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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