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Significant Customer and Other Information (Details) | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
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 | 48.00% | 56.00% | 53.00%
Sales [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 18.00% | 19.00% | 19.00%
Sales [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 21.00% | 11.00% | 11.00%
Sales [Member] | Rotating Electrical Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 78.00% | 82.00% | 89.00%
Sales [Member] | Wheel Hub Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 20.00% | 17.00% | 11.00%
Sales [Member] | Brake Master Cylinders Products [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.00% | 1.00% | 0.00%
Accounts Receivable - Trade [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 37.00% | 48.00% |
Accounts Receivable - Trade [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 17.00% | 16.00% |
Accounts Receivable - Trade [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 15.00% | 12.00% |
Significant Supplier Purchases [Member] | Supplier A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 6.00% | 12.00% | 13.00%

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