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Lease Obligations, Other Commitments, and Contingencies - Components of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 29, 2020
Feb. 29, 2020
Lease Type    
Consolidated operating lease expense $ 481 $ 1,427
Consolidated financing lease amortization 23 39
Consolidated financing lease interest 4 18
Consolidated financing lease expense 27 57
Net lease cost $ 508 $ 1,484