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Significant Customer and Other Information (Details) | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
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 | 44.00% | 48.00% | 56.00%
Sales [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 20.00% | 18.00% | 19.00%
Sales [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 19.00% | 21.00% | 11.00%
Sales [Member] | Customer D [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 4.00% | 3.00% | 3.00%
Sales [Member] | Rotating Electrical Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 78.00% | 78.00% | 82.00%
Sales [Member] | Wheel Hub Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 19.00% | 20.00% | 17.00%
Sales [Member] | Brake Master Cylinders Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 3.00% | 2.00% | 1.00%
Accounts Receivable - Trade [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 33.00% | 37.00% |
Accounts Receivable - Trade [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 18.00% | 17.00% |
Accounts Receivable - Trade [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 12.00% | 15.00% |
Accounts Receivable - Trade [Member] | Customer D [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 16.00% | 9.00% |
Significant Supplier Purchases [Member] | Supplier A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage |  |  | 12.00%

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611 + Details
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