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Significant Customer and Other Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Net Sales [Member]
Concentration Risk [Abstract]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Net Sales [Member] | Customer A [Member]
Concentration Risk [Abstract]
Concentration risk percentage	45.00%	41.00%	45.00%	40.00%
Net Sales [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage	21.00%	20.00%	23.00%	21.00%
Net Sales [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage	23.00%	23.00%	20.00%	22.00%
Net Sales [Member] | Rotating Electrical Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	80.00%	77.00%	77.00%	76.00%
Net Sales [Member] | Wheel Hub Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	12.00%	15.00%	14.00%	16.00%
Net Sales [Member] | Brake-Related Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	7.00%	6.00%	8.00%	6.00%
Net Sales [Member] | Other Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	1.00%	2.00%	1.00%	2.00%
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Abstract]
Concentration risk percentage	42.00%				28.00%
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage	20.00%				14.00%
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage	18.00%				33.00%

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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