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Leases, Balance Sheet Information (Details) - USD ($) | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Assets [Abstract] |  |
Operating, Operating lease assets | $ 74,685,000 | $ 53,029,000
Finance, Plant and equipment | 8,559,000 | 6,922,000
Total leased assets | 83,244,000 | 59,951,000
Current [Abstract] |  |
Operating, Operating lease liabilities | 6,232,000 | 5,104,000
Finance, Other current liabilities | 2,555,000 | 2,059,000
Long-term [Abstract] |  |
Operating, Long-term operating lease liabilities | 71,569,000 | 61,425,000
Finance, Other liabilities | 4,981,000 | 3,905,000
Total lease liabilities | $ 85,337,000 | $ 72,493,000

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