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Fair Value - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Feb. 28, 2021 | May 31, 2020
--- | --- | ---
Financial Liabilities |  |
Contingent consideration for acquisition earn outs | $ 15,362 | $ 15,647
Total Financial Liabilities | 15,362 | 15,647
Level 1 |  |
Financial Liabilities |  |
Contingent consideration for acquisition earn outs | 0 | 0
Total Financial Liabilities | 0 | 0
Level 2 |  |
Financial Liabilities |  |
Contingent consideration for acquisition earn outs | 0 | 0
Total Financial Liabilities | 0 | 0
Level 3 |  |
Financial Liabilities |  |
Contingent consideration for acquisition earn outs | 15,362 | 15,647
Total Financial Liabilities | $ 15,362 | $ 15,647

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