Shareholders' Equity - Schedule Of Tax Effects Allocated To Each Components Of Other Comprehensive Income Loss (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Accumulated Unrealized Loss On Afs Debt Securities [Abstract] | |||
| Other income/ (loss), net | $ 7.6 | $ (42.5) | $ (3.7) |
| Income before tax | 7.6 | (42.5) | (3.7) |
| Total reclassification out of AOCI | $ 7.6 | $ (42.5) | $ (3.7) |
| X | ||||||||||
- Definition Amount, before adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Accumulated unrealized loss on AFS debt securities. No definition available.
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