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Significant Customer and Other Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
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	41.00%	39.00%	40.00%	38.00%
Net Sales [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage	20.00%	26.00%	21.00%	24.00%
Net Sales [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage	23.00%	20.00%	22.00%	22.00%
Net Sales [Member] | Rotating Electrical Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	77.00%	80.00%	76.00%	79.00%
Net Sales [Member] | Wheel Hub Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	15.00%	14.00%	16.00%	16.00%
Net Sales [Member] | Brake Caliper Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	3.00%	0.00%	2.00%	0.00%
Net Sales [Member] | Brake Master Cylinders Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	1.00%	2.00%	2.00%	2.00%
Net Sales [Member] | Other Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	4.00%	4.00%	4.00%	3.00%
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Abstract]
Concentration risk percentage			33.00%		34.00%
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage			15.00%		18.00%
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage			23.00%		16.00%

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- References

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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