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Leases, Balance Sheet Information (Details) - USD ($)
Sep. 30, 2021
Mar. 31, 2021
Assets [Abstract]    
Operating, Operating lease assets $ 84,576,000 $ 71,513,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating, Operating lease assets Operating, Operating lease assets
Finance, Plant and equipment $ 8,036,000 $ 8,852,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Plant and equipment - net Plant and equipment - net
Total leased assets $ 92,612,000 $ 80,365,000
Current [Abstract]    
Operating, Operating lease liabilities $ 6,033,000 $ 6,439,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating, Operating lease liabilities Operating, Operating lease liabilities
Finance, Other current liabilities $ 2,439,000 $ 2,640,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Long-term [Abstract]    
Operating, Long-term operating lease liabilities $ 83,998,000 $ 70,551,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating, Long-term operating lease liabilities Operating, Long-term operating lease liabilities
Finance, Other liabilities $ 4,020,000 $ 4,995,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Total lease liabilities $ 96,490,000 $ 84,625,000