Summary of accounting policies - Tax Receivable Agreement and Liability Narrative (Details) - USD ($) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Feb. 13, 2023 |
|
| Organization Consolidation And Presentation Of Financial Statements [Line Items] | ||||
| Tax receivable agreement (TRA) liability | $ 372,659 | $ 394,879 | ||
| Percentage of tax benefits on tax receivable agreement | 85.00% | |||
| Tax receivable agreement payment | 27,427 | 15,520 | $ 0 | |
| Tax Receivable Agreement | ||||
| Organization Consolidation And Presentation Of Financial Statements [Line Items] | ||||
| Total liabilities relating to tax receivable agreement | 393,200 | 419,400 | ||
| Tax receivable agreement (TRA) liability | 372,700 | 394,900 | ||
| Tax receivable agreement (TRA) liability | 372,700 | 394,900 | ||
| Tax Receivable Agreement | Other current liabilities | ||||
| Organization Consolidation And Presentation Of Financial Statements [Line Items] | ||||
| Tax receivable agreement (TRA) liability | $ 20,500 | $ 24,500 | ||