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Investment in Affiliate (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Equity method investment [Abstract]      
Equity in earnings of non-consolidated affiliate [1] $ 0.2 $ 0.7 $ 0.2
Nikkei Heat Exchanger Company, Ltd. [Member]      
Equity method investment [Abstract]      
Ownership percentage 50.00%    
Selling price $ 3.8    
Gain (loss) on sale of business 0.1    
Gain (loss) on write-off of accumulated foreign currency translation 0.6    
Equity method investment   3.8  
Equity in earnings of non-consolidated affiliate $ 0.1 $ 0.7 $ 0.2
[1] During fiscal 2020, the Company sold its ownership interest in Nikkei Heat Exchanger Company, Ltd.  As a result of the sale, the Company recorded a gain of $0.1 million, which is included within the fiscal 2020 amount.  See Note 12 for additional information.