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Significant Customer and Other Information - Concentrations of Risk (Details)	12 Months Ended
	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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

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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

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