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%