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Significant Customer and Other Information - Significant Customer and Other Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Customer Concentration Risk [Member] | Customer A [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	38.00%	34.00%	38.00%	37.00%
Customer Concentration Risk [Member] | Customer A [Member] | Accounts Receivable - Trade [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage			36.00%		41.00%
Customer Concentration Risk [Member] | Customer B [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	28.00%	21.00%	26.00%	20.00%
Customer Concentration Risk [Member] | Customer B [Member] | Accounts Receivable - Trade [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage			34.00%		26.00%
Customer Concentration Risk [Member] | Customer C [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	21.00%	31.00%	21.00%	29.00%
Customer Concentration Risk [Member] | Customer C [Member] | Accounts Receivable - Trade [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage			7.00%		7.00%
Product Concentration Risk [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Rotating Electrical Products [Member] | Product Concentration Risk [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	69.00%	68.00%	68.00%	67.00%
Brake-Related Products [Member] | Product Concentration Risk [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	21.00%	21.00%	22.00%	22.00%
Wheel Hub Products [Member] | Product Concentration Risk [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	6.00%	7.00%	6.00%	7.00%
Other Products [Member] | Product Concentration Risk [Member] | Net Sales [Member]
Significant Customer and Other Information [Abstract]
Concentration risk percentage	4.00%	4.00%	4.00%	4.00%

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