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Benefit plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
401(k) Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Contributions to the plan | $ 3.7 | $ 2.4
Pension Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Maximum percentage of contribution by employee of their annual base salary (as a percent) | 8.00% |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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