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v3.20.1

Significant Customer and Other Information (Details) | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Net Sales [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 100.00% | 100.00% | 100.00%
Net Sales [Member] | Rotating Electrical Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 73.00% | 79.00% | 78.00%
Net Sales [Member] | Wheel Hub Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 15.00% | 15.00% | 17.00%
Net Sales [Member] | Brake-Related Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 9.00% | 3.00% | 3.00%
Net Sales [Member] | Other Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 3.00% | 3.00% | 2.00%
Net Sales [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 38.00% | 38.00% | 41.00%
Net Sales [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 20.00% | 22.00% | 25.00%
Net Sales [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 26.00% | 23.00% | 19.00%
Accounts Receivable - Trade [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 28.00% | 34.00% |
Accounts Receivable - Trade [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 14.00% | 18.00% |
Accounts Receivable - Trade [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 33.00% | 16.00% |

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