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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance |  | $ 353,642 | $ 150,047 |
Valuation allowance | $ 69,000 |  |  |
Impact on effective tax rate |  | 16,100 |  |
Accrued interest or penalties associated with uncertain tax positions |  | 2,000 | 1,100 | $ 1,200
Accrued interest and penalties |  | 16,900 | 16,900 |
Inmarsat Holdings [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Accrued interest and penalties recorded as part of the acquisition |  | 19,200 |  |
Deferred Tax Asset Valuation Allowance [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance |  | 139,687 | $ 71,976 | $ 5,119
United States [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 345,800 |  |
Operating loss carryforwards expiration beginning year |  | 2029 |  |
Research and development expenditures, amortization period |  |  | 5 years |
Tax years subject to examination |  | 2021 and thereafter |  |
United States [Member] | Research & Development [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward amount |  | $ 115,800 |  |
United States [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2040 |  |
State [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 149,000 |  |
Operating loss carryforwards expiration beginning year |  | 2025 |  |
Tax years subject to examination |  | 2021 and thereafter |  |
State [Member] | Research & Development [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward amount |  | $ 191,500 |  |
State [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2026 |  |
Foreign [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Research and development expenditures, amortization period |  |  | 15 years |
Tax years subject to examination |  | 2020 and thereafter |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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