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