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Leases, Balance Sheet Information (Details) - USD ($)
Sep. 30, 2020
Mar. 31, 2020
Assets [Abstract]    
Operating, Operating lease assets $ 68,530,000 $ 53,029,000
Finance, Plant and equipment 7,506,000 6,922,000
Total leased assets 76,036,000 59,951,000
Current [Abstract]    
Operating, Operating lease liabilities 6,228,000 5,104,000
Finance, Other current liabilities 2,333,000 2,059,000
Long-term [Abstract]    
Operating, Long-term operating lease liabilities 72,959,000 61,425,000
Finance, Other liabilities 4,299,000 3,905,000
Total lease liabilities $ 85,819,000 $ 72,493,000