Significant Accounting Policies, Sale of Nikkei Heat Exchanger Company, Ltd. (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Sale of Business [Abstract]
Equity in earnings of non-consolidated affiliate	[1]	$ 0.0	$ 0.2	$ 0.7
Nikkei Heat Exchanger Company, Ltd [Member]
Sale of Business [Abstract]
Ownership percentage			50.00%
Selling price			$ 3.8
Gain on write-off of accumulated foreign currency translation			0.6
Equity in earnings of non-consolidated affiliate			0.1	$ 0.7
Nikkei Heat Exchanger Company, Ltd [Member] | Other Income (Expense) [Member]
Sale of Business [Abstract]
Gain on sale of investment			$ 0.1

[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 1 for additional information.