Basis of Presentation - Additional Information (Detail) |
1 Months Ended | 3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2025
USD ($)
|
Sep. 30, 2026
USD ($)
shares
|
Sep. 30, 2025
USD ($)
shares
|
Jun. 30, 2025
USD ($)
|
Sep. 30, 2026
USD ($)
Segment
shares
|
Sep. 30, 2025
USD ($)
shares
|
Mar. 31, 2026
USD ($)
shares
|
Mar. 31, 2024
USD ($)
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|
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Revenue, practical expedient, financing component | true | |||||||
| Cash dividends | $ 155,700,000 | |||||||
| Company's share of dividend | $ 96,000,000 | |||||||
| Reduction to noncontrolling interest | $ 59,700,000 | $ 59,695,000 | ||||||
| Distributions to minority shareholders | 13,800,000 | 59,695,000 | ||||||
| Remaining performance obligations | $ 4,200,000,000 | $ 4,200,000,000 | ||||||
| Number of reportable segments | Segment | 2 | |||||||
| Increase in collections in excess of revenues and deferred revenues | $ 63,900,000 | |||||||
| Unbilled accounts receivable decreased | 18,300,000 | |||||||
| Collections in excess of revenues and deferred revenues, recognized revenue | 62,100,000 | $ 71,700,000 | $ 152,200,000 | 177,800,000 | ||||
| Revenue, practical expedient, incremental cost of obtaining contract [true false] | true | |||||||
| Capitalized contract cost amortization and reduction of carrying value associated with contract termination | 5,300,000 | 6,200,000 | $ 10,600,000 | 12,700,000 | ||||
| Capitalized interest expense | 43,100,000 | 60,400,000 | $ 105,500,000 | 115,600,000 | ||||
| Operating lease, existence of option to terminate | true | |||||||
| Operating lease, option to terminate, description | some of which include renewal options, and some of which include options to terminate the leases within one year. | |||||||
| Total capitalized costs related to patents | 147,400,000 | $ 147,400,000 | $ 144,500,000 | |||||
| Accumulated amortization of patents, orbital slots and other licenses | 33,900,000 | 33,900,000 | 24,300,000 | |||||
| Patents, orbital slots and other licenses amortization expense | 6,100,000 | 3,500,000 | 9,600,000 | 6,800,000 | ||||
| Debt issuance costs capitalized | 0 | 0 | ||||||
| Self-insurance liability | 5,600,000 | 5,600,000 | 5,600,000 | |||||
| Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements | value | 52,262,000 | 1,956,000 | 80,987,000 | 6,624,000 | ||||
| Stock-based compensation expense | 58,359,000 | 34,829,000 | ||||||
| Insurance recovery proceeds | 10,000,000 | |||||||
| Continuing Operations [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Stock-based compensation expense | 34,200,000 | $ 20,100,000 | 58,400,000 | $ 34,800,000 | ||||
| Equatys [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Equity commitment upon formation by Viasat | 400,000,000 | |||||||
| Equity commitment upon formation by Space42 | 400,000,000 | |||||||
| Space42 [Member] | Equatys [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Potential additional equity commitment by Space42 | 200,000,000 | |||||||
| Total equity funding commitment in the aggregate | $ 1,000,000,000 | |||||||
| Accounting Standards Update 2023-06 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. This ASU amends certain disclosure and presentation requirements for a variety of topics within the FASB ASC. These amendments will also align the requirements in the ASC with the SEC's regulations. The effective date for each amended topic in the ASC is the date on which the SEC’s removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective, and will not be effective if the SEC has not removed the applicable disclosure requirements by June 30, 2027. Early adoption is prohibited. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2024-03 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. This ASU requires additional disclosures about certain categories of costs and expenses in the notes to financial statements. As clarified in ASU 2025-01, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, the new standard will become effective for the Company’s annual disclosures beginning in fiscal year 2028 and for interim disclosures beginning in fiscal year 2029. Early adoption is permitted and the amendments should be applied either prospectively to financial statements issued for reporting periods after the effective date of the ASU or retrospectively to any or all periods presented in the financial statements. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-04 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In May 2025, the FASB issued ASU 2025-04, Compensation – Stock Compensation (Topic 718) and Revenue from Contracts with Customers (Topic 606): Clarifications to Share-Based Consideration Payable to a Customer. The purpose of this ASU is to reduce diversity in practice and improve the decision usefulness and operability of the guidance for share-based consideration payable to a customer in conjunction with selling goods or services. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2028. Early adoption is permitted and the new guidance can be applied either on a modified retrospective or a retrospective basis. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-05 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In July 2025, the FASB issued ASU 2025-05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. The purpose of this ASU is to allow entities to apply a practical expedient when estimating expected credit losses for current accounts receivable and current contract assets that arise from transactions accounted for under Topic 606. The Company adopted the new guidance on a prospective basis in the first quarter of fiscal year 2027 and the guidance did not have a material impact on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-06 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In September 2025, the FASB issued ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The purpose of this ASU is to modernize the accounting guidance for the costs to develop software for internal use by removing all references to prescriptive and sequential software development project stages and providing further guidance on when an entity is required to start capitalizing eligible costs. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2029. Early adoption is permitted and the new guidance should be applied either on a prospective transition, a modified transition or a retrospective transition approach. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-07 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In September 2025, the FASB issued ASU 2025-07, Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606): Derivatives Scope Refinements and Scope Clarification for Share-Based Noncash Consideration from a Customer in a Revenue Contract. This ASU expands the scope exception in Topic 815 and clarifies the guidance on share-based noncash consideration from a customer in Topic 606. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2028. Early adoption is permitted and the new guidance should be applied either on a prospective or a modified retrospective basis. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-08 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In November 2025, the FASB issued ASU 2025-08, Financial Instruments - Credit Losses (Topic 326): Purchased Loans. This ASU expands the population of acquired financial assets subject to the gross-up approach to include purchased seasoned loans. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2028. Early adoption is permitted and the new guidance should be applied prospectively. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-09 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In November 2025, the FASB issued ASU 2025-09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements. This ASU includes five targeted amendments intended to more closely align hedge accounting with the underlying economics of entities' risk management activities. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2028. Early adoption is permitted and the new guidance should be applied prospectively. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-10 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities. The purpose of this ASU is to reduce diversity in practice by establishing accounting guidance for recognition, measurement and presentation of a government grant received by a business entity. The new standard will become effective for the Company's interim and annual disclosures beginning in fiscal year 2030. Early adoption is permitted and the new guidance should be applied either on a modified prospective, a modified retrospective or a full retrospective basis. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-11 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In December 2025, the FASB issued ASU 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. This ASU provides a comprehensive list of interim disclosures that are required by GAAP and clarifies the applicability of Topic 270, as well as a requirement to disclose events since the end of the last annual reporting period that have a material impact on the entity. The new standard will become effective for the Company's interim disclosures beginning in fiscal year 2029. Early adoption is permitted and the new guidance should be applied prospectively or retrospectively to any or all prior periods presented in the financial statements. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2025-12 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In December 2025, the FASB issued ASU 2025-12, Codification Improvements. This ASU includes amendments to the FASB Accounting Standards Codification for a broad range of topics arising from technical corrections, unintended application of the Codification, clarifications, and other minor improvements. These amendments are not expected to have a significant effect on current accounting practice for most entities. The new standard will become effective for the Company's interim and annual reporting periods beginning in fiscal year 2028. Early adoption is permitted on an issue-by-issue basis and the new guidance should be applied prospectively or retrospectively on an issue-by-issue basis. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| Accounting Standards Update 2026 02 [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Description of new accounting pronouncements | In May 2026, the FASB issued ASU 2026-02, Environmental Credits and Environmental Credit Obligations (Topic 818). This ASU provides recognition, measurement, presentation, and disclosure requirements for environmental credits and environmental credit obligations. The new standard will become effective for the Company's interim and annual reporting periods beginning in fiscal year 2029. Early adoption is permitted and the new guidance should be applied retrospectively. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. | |||||||
| CPE Leased Equipment [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Property, equipment and satellites, cost | 508,254,000 | $ 508,254,000 | 522,882,000 | |||||
| Accumulated depreciation and amortization | 340,400,000 | 340,400,000 | 349,400,000 | |||||
| Satellites [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Insurance claim receivables | $ 770,000,000 | |||||||
| Insurance recovery proceeds | $ 10,000,000 | |||||||
| VSAT Satellites [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Reduction to carrying value including capitalized interest | $ 1,670 | |||||||
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Deferred customer contract costs | 56,100,000 | 56,100,000 | 56,100,000 | |||||
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Deferred customer contract costs | 65,000,000 | 65,000,000 | 25,000,000 | |||||
| Deferred Customer Contract Acquisition Costs [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Deferred customer contract costs | 6,700,000 | 6,700,000 | 8,200,000 | |||||
| Deferred Customer Contract Fulfillment Costs [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Deferred customer contract costs | 114,500,000 | 114,500,000 | 72,900,000 | |||||
| Unfavorable Regulatory Action [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Accrued reserves | 13,100,000 | 13,100,000 | 15,100,000 | |||||
| Indemnification Guarantee [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Accrued reserves | $ 0 | $ 0 | $ 0 | |||||
| Common Stock [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Common stock issued based on the vesting terms of certain restricted stock unit agreements | shares | 1,786,458 | 226,081 | 2,869,387 | 1,578,052 | ||||
| Common Stock Held in Treasury [Member] | ||||||||
| Company And Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Shares of common stock outstanding | shares | 0 | 0 | 0 | |||||
| Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements, shares | shares | 651,736 | 99,480 | 1,079,257 | 602,644 | ||||
| Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements | value | $ 52,300,000 | $ 2,000,000 | $ 81,000,000 | $ 6,600,000 | ||||