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Summary of Significant Accounting Policies (Concentration Risk) (Details) - Customer concentration risk | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Customer A | Gross sales |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 14.00% | 13.00% | 13.00%
Customer A | Accounts receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 14.00% | 14.00% |
Customer B | Gross sales |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 19.00% | 18.00% | 19.00%
Customer B | Accounts receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 21.00% | 20.00% |
Customer C | Gross sales |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 12.00% | 14.00% | 15.00%
Customer C | Accounts receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration credit risk by major customer (as a percent) | 10.00% | 15.00% |

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