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v3.20.1

Accounting Principles and Practices (Narratives) (Details) | 12 Months Ended
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Mar. 31, 2020 USD ($) Reporting_Unit Segment Collective_Bargaining_Agreement | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |
Standard and Extended Product Warranty Accrual | $ 3,581,000 | $ 3,634,000 | $ 3,791,000
Asset Impairment Charges | 0 |  |
Advertising expenses | $ 1,648,000 | $ 2,452,000 | 2,683,000
Number of segments | Segment | 1 |  |
Number of reporting units | Reporting_Unit | 2 |  |
Percentage of LIFO inventory |  | 36.00% |
Research and development costs | $ 11,310,000 | $ 13,491,000 | 13,617,000
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued | 2,723,000 | 3,405,000 |
Standard and Extended Product Warranty Accrual, Decrease for Payments | 2,548,000 | 3,625,000 |
Foreign Currency Transaction Gain (Loss), before Tax | 1,514,000 | (843,000) | $ (1,539,000)
Warranty Obligations [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ (228,000) | 129,000 |
Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful life of intangible assets | 1 year |  |
Minimum | Building and building equipment |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives of property plant and equipment | 15 years |  |
Minimum | Vehicles/Equipment |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives of property plant and equipment | 3 years |  |
Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful life of intangible assets | 25 years |  |
Maximum | Building and building equipment |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives of property plant and equipment | 40 years |  |
Maximum | Vehicles/Equipment |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives of property plant and equipment | 18 years |  |
Workforce Subject to Collective Bargaining Arrangements | Unionized Employees Concentration Risk |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of employees | 8.00% |  |
Number of collective bargaining agreements | Collective_Bargaining_Agreement | 3 |  |
Short-term Contract with Customer [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Revenue, Performance Obligation, Description of Warranty | 12 |  |
Long-term Contract with Customer [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Revenue, Performance Obligation, Description of Warranty | 24 to 36 |  |
CES and STB [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Standard and Extended Product Warranty Accrual, Decrease for Payments | $ 0 | $ (66,000) |

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