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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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