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Basis of Presentation - Additional Information (Detail 3) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | May 30, 2023
Interest Rate Cap [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Interest rate cap contracts, description |  | The interest rate cap contracts provided protection from Compound SOFR rates over 2%, covered the total nominal amount of Inmarsat's senior secured term loan facilities of $1.6 billion, and matured in February 2025. At the time of the acquisition, the Company continued to account for the interest rate cap contracts as cash-flow hedges. Upon amendment of Inmarsat's senior secured term loan facilities in March 2024 (see Note 6 — Senior Notes and Other Long-Term Debt for more information), the portion of the interest rate cap contracts related to Inmarsat's $1.3 billion senior secured term loan facility (the 2024 Inmarsat Term Loan Facility) continued to be accounted for as cash-flow hedges, as the interest rate cap contracts remained in place with their original maturity date. |  |
Gain (loss) in other comprehensive income arising from changes in the fair value of derivative contracts (designated as cash-flow hedging instruments) | $ (3.1) |  |  |
Derivative contracts gain (loss) reclassified to other comprehensive income and interest expense, net (based on the nature of the underlying transaction) | (3.4) |  | $ (8.1) |
Interest rate cash flow hedge gain loss reclassified to earnings tax expense (benefit) |  |  | (2.0) |
Cash received | $ 14.4 |  | $ 28.5 |
Inmarsat Term Loan Facility [Member] | Interest Rate Cap [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Principal amount of debt |  |  |  | $ 1,600.0
Interest rate cap |  |  |  | 2.00%
Maximum [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  | 38 years |  |
Financing lease, remaining lease term |  | 14 years |  |
Operating lease, remaining lease term |  | 16 years |  |
Maximum [Member] | Software Development [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  | 7 years |  |
Minimum [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  | 2 years |  |
Financing lease, remaining lease term |  | 1 year |  |
Operating lease, remaining lease term |  | 1 year |  |
Minimum [Member] | Software Development [Member] |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  | 3 years |  |

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