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Leases, Balance Sheet Information (Details) - USD ($) | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Assets: [Abstract] |  |
Operating, Operating lease assets | $ 65,652,000 | $ 0
Finance, Plant and equipment | 6,718,000 |
Total leased assets | 72,370,000 |
Current [Abstract] |  |
Operating, Operating lease liabilities | 4,991,000 | 0
Finance, Other current liabilities | 1,965,000 |
Long-term [Abstract] |  |
Operating, Long-term operating lease liabilities | 61,805,000 | $ 0
Finance, Other liabilities | 3,766,000 |
Total lease liabilities | $ 72,527,000 |

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