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Summary of Significant Accounting Policies, Inventory, Inventory Unreturned and Contract Assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019
Inventory - net [Abstract] |  |
Prior period over which allocations of labor and variable and fixed overhead costs are determined based on average actual use of production facilities | 12 months |
Reserve for excess and obsolete inventory | $ 13,208,000 | $ 11,899,000
Inventory Unreturned [Abstract] |  |
Period of normal operating cycle | 1 year |
Minimum [Member] |  |
Contract Assets [Abstract] |  |
Amortization period for core premiums | 6 years |
Maximum [Member] |  |
Inventory - net [Abstract] |  |
Percentage of inventory reserve to cost if no liquidation market exists for part | 100.00% |
Contract Assets [Abstract] |  |
Amortization period for core premiums | 8 years |

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- Definition Prior period over which the allocations of labor and variable and fixed overhead costs are determined based on the average actual use of the production facilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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