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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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