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Significant Customer and Other Information - Concentrations of Risk (Details) | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Customer Concentration Risk [Member] | Customer A [Member] | Net Sales [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 39.00% | 35.00% | 37.00%
Customer Concentration Risk [Member] | Customer A [Member] | Accounts Receivable - Trade [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 41.00% | 35.00% |
Customer Concentration Risk [Member] | Customer C [Member] | Net Sales [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 26.00% | 27.00% | 24.00%
Customer Concentration Risk [Member] | Customer C [Member] | Accounts Receivable - Trade [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 7.00% | 13.00% |
Customer Concentration Risk [Member] | Customer B [Member] | Net Sales [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 21.00% | 21.00% | 23.00%
Customer Concentration Risk [Member] | Customer B [Member] | Accounts Receivable - Trade [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 26.00% | 25.00% |
Product Concentration Risk [Member] | Net Sales [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 100.00% | 100.00% | 100.00%
Product Concentration Risk [Member] | Net Sales [Member] | Rotating Electrical Products [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 67.00% | 66.00% | 67.00%
Product Concentration Risk [Member] | Net Sales [Member] | Brake-Related Products [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 21.00% | 20.00% | 18.00%
Product Concentration Risk [Member] | Net Sales [Member] | Wheel Hub Products [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 8.00% | 10.00% | 11.00%
Product Concentration Risk [Member] | Net Sales [Member] | Other Products [Member] |  |  |
Significant Customer and Other Information [Abstract] |  |  |
Concentration risk percentage | 4.00% | 4.00% | 4.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-20 + Details
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