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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Feb. 28, 2021 | May 31, 2020
--- | --- | ---
Level 1 |  |
Assets: |  |
Assets held for sale - nonrecurring | $ 0 | $ 0
Investment in non-public company | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Interest rate swap contracts | 0 | 0
Total liabilities | 0 | 0
Level 2 |  |
Assets: |  |
Assets held for sale - nonrecurring | 0 | 0
Investment in non-public company | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Interest rate swap contracts | 2,174 | 3,578
Total liabilities | 2,174 | 3,578
Level 3 |  |
Assets: |  |
Assets held for sale - nonrecurring | 0 | 2,607
Investment in non-public company | 45,100 | 56,900
Total assets | 45,100 | 59,507
Liabilities: |  |
Interest rate swap contracts | 0 | 0
Total liabilities | $ 0 | $ 0

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