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Significant Customer and Other Information | 6 Months Ended
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Sep. 30, 2025
Significant Customer and Other Information [Abstract] |
Significant Customer and Other Information | 6. Significant Customer and Other Information Significant Customer Concentrations The largest customers accounted for the following percentage of consolidated net sales:
|  |  | Three Months Ended September 30, |  |  |  | Six Months Ended September 30, |
|  |  | 2025 |  |  |  | 2024 |  |  |  | 2025 |  |  |  | 2024 |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer A |  |  | 38 | % |  |  | 34 | % |  |  | 38 | % |  |  | 37 | %
Customer B |  |  | 28 | % |  |  | 21 | % |  |  | 26 | % |  |  | 20 | %
Customer C |  |  | 21 | % |  |  | 31 | % |  |  | 21 | % |  |  | 29 | %
Revenues for these customers were derived from the Hard Parts segment and Test Solutions and Diagnostic Equipment segment. See Note 18 for a discussion of the Company’s segments. The largest customers accounted for the following percentage of accounts receivable – trade:
|  |  | September 30, 2025 |  |  |  | March 31, 2025 |
Accounts receivable - trade |  |  |  |  |  |  |  |
Customer A |  |  | 36 | % |  |  | 41 | %
Customer B |  |  | 34 | % |  |  | 26 | %
Customer C |  |  | 7 | % |  |  | 7 | %
Geographic and Product Information The Company’s products are sold predominantly in North America and accounted for the following percentages of consolidated net sales:
|  |  | Three Months Ended September 30, |  |  |  | Six Months Ended September 30, |
|  |  | 2025 |  |  | 2024 |  |  |  | 2025 |  |  |  | 2024 |
Product line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rotating electrical products |  |  | 69 | % |  |  | 68 | % |  |  | 68 | % |  |  | 67 | %
Brake-related products |  |  | 21 | % |  |  | 21 | % |  |  | 22 | % |  |  | 22 | %
Wheel hub products |  |  | 6 | % |  |  | 7 | % |  |  | 6 | % |  |  | 7 | %
Other products |  |  | 4 | % |  |  | 4 | % |  |  | 4 | % |  |  | 4 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Significant Supplier Concentrations The Company had no suppliers that accounted for more than 10% of inventory purchases for the three and six months ended September 30, 2025 and 2024.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482836/275-10-55-3A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-2A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/275/tableOfContent + Details
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