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Leases, Cost Recogized in Consolidated Statement of Operations (Details) - USD ($)
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Lease cost [Abstract]      
Operating lease cost $ 8,733,000 [1] $ 6,188,000 $ 4,362,000
Short-term lease cost 1,263,000    
Variable lease cost 600,000    
Finance lease cost: [Abstract]      
Amortization of finance lease assets 1,616,000    
Interest on finance lease liabilities 281,000    
Total lease cost $ 12,493,000    
[1] During the years ended March 31, 2019 and 2018, the Company incurred total operating lease expenses of $6,188,000 and $4,362,000, respectively.