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Investment in Affiliate (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Equity method investment [Abstract]      
Equity in earnings of non-consolidated affiliate $ 0.7 $ 0.2 $ 0.1
Nikkei Heat Exchanger Company, Ltd. [Member]      
Equity method investment [Abstract]      
Equity method investment, percent owned 50.00%    
Equity method investment $ 3.8 3.6  
Equity in earnings of non-consolidated affiliate $ 0.7 $ 0.2 $ 0.1