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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.

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