| Goodwill and Other Impairments | 12 Months Ended | 
|---|---|
| Mar. 31, 2021 | |
| Goodwill And Intangible Assets Disclosure [Abstract] | |
| Goodwill and Other Impairments | Note 6– Goodwill and Other Impairments: 
 Finite-lived intangible assets are amortized on a straight-line basis over their estimated useful lives. Intangible amortization expense was $0, $0 and $180 in fiscal 2021, fiscal 2020 and fiscal 2019, respectively. As disclosed in Note 3, in fiscal 2019, the Company's Board of Directors approved a plan to sell Energy Steel. As a result, an impairment loss totaling $6,449 was recorded related to the disposition of Energy Steel which included impairment losses of $1,700, $2,000, $1,208, $1,222 and $319 for permits, tradename, customer relationships, goodwill and other long-lived assets, respectively. In fiscal 2020, the Company completed the sale of Energy Steel. 
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- References No definition available. 
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- Definition The entire disclosure for goodwill and intangible assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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