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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands	May 31, 2016	May 31, 2015
Financial Assets
Marketable securities	$ 1,653	$ 1,689
Total Financial Assets	1,653	1,689
Financial Liabilities
Total Financial Liabilities	38,275	47,641
Interest rate swap agreements
Financial Liabilities
Total Financial Liabilities		257
Contingent liability for acquisition earn out
Financial Liabilities
Total Financial Liabilities	38,275	47,384
New York State government agency obligations
Financial Assets
Marketable securities	1,653	1,689
Level 1
Financial Assets
Marketable securities	0	0
Total Financial Assets	0	0
Financial Liabilities
Total Financial Liabilities	0	0
Level 1 | Interest rate swap agreements
Financial Liabilities
Total Financial Liabilities		0
Level 1 | Contingent liability for acquisition earn out
Financial Liabilities
Total Financial Liabilities	0	0
Level 1 | New York State government agency obligations
Financial Assets
Marketable securities	0	0
Level 2
Financial Assets
Marketable securities	0	0
Total Financial Assets	0	0
Financial Liabilities
Total Financial Liabilities	0	257
Level 2 | Interest rate swap agreements
Financial Liabilities
Total Financial Liabilities		257
Level 2 | Contingent liability for acquisition earn out
Financial Liabilities
Total Financial Liabilities	0	0
Level 2 | New York State government agency obligations
Financial Assets
Marketable securities	0	0
Level 3
Financial Assets
Marketable securities	1,653	1,689
Total Financial Assets	1,653	1,689
Financial Liabilities
Total Financial Liabilities	38,275	47,384
Level 3 | Interest rate swap agreements
Financial Liabilities
Total Financial Liabilities		0
Level 3 | Contingent liability for acquisition earn out
Financial Liabilities
Total Financial Liabilities	38,275	47,384
Level 3 | New York State government agency obligations
Financial Assets
Marketable securities	$ 1,653	$ 1,689

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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