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Significant Customer and Other Information (Details)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Sales [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%
Sales [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage	41.00%	44.00%	48.00%
Sales [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage	24.00%	20.00%	18.00%
Sales [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage	19.00%	19.00%	21.00%
Sales [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	4.00%	3.00%
Sales [Member] | Rotating Electrical Products [Member]
Concentration Risk [Line Items]
Concentration risk percentage	78.00%	78.00%	78.00%
Sales [Member] | Wheel Hub Products [Member]
Concentration Risk [Line Items]
Concentration risk percentage	17.00%	19.00%	20.00%
Sales [Member] | Brake Master Cylinders Products [Member]
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	3.00%	2.00%
Sales [Member] | Other Products [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	0.00%	0.00%
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage	36.00%	33.00%
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	18.00%
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	12.00%
Accounts Receivable - Trade [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	16.00%

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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