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Basis of Presentation - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) Segment shares | Sep. 30, 2020 USD ($) shares | Apr. 30, 2021 | Mar. 31, 2021 USD ($) shares | Jul. 23, 2020 $ / shares
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net proceeds form sale of shares after deducting offering expenses |  | $ 174,700,000 |  | $ 174,749,000 |  |  |
Revenue, practical expedient, financing component |  |  | true |  |  |  |
Remaining performance obligations | $ 2,300,000,000 |  | $ 2,300,000,000 |  |  |  |
Number of reportable segments | Segment |  |  | 3 |  |  |  |
Increase (decrease) in unbilled accounts receivable |  |  | $ 31,300,000 |  |  |  |
Decrease in collections in excess of revenues and deferred revenues |  |  | (15,500,000) |  |  |  |
Collections in excess of revenues and deferred revenues, recognized revenue | 43,800,000 | 17,000,000.0 | 122,000,000.0 | 74,600,000 |  |  |
Capitalized interest expense | 24,800,000 | 20,000,000.0 | $ 48,400,000 | 35,900,000 |  |  |
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 | 3,500,000 |  | $ 3,500,000 |  |  | $ 3,500,000 |
Total capitalized costs related to orbital slots and other licenses | 60,400,000 |  | 60,400,000 |  |  | 53,800,000 |
Accumulated amortization of patents, orbital slots and other licenses | 4,600,000 |  | 4,600,000 |  |  | 4,400,000 |
Debt issuance costs capitalized |  |  | 0 | 5,100,000 |  |  |
Capitalized costs, net, related to software developed for resale | 228,910,000 |  | 228,910,000 |  |  | 237,100,000 |
Capitalized cost related to software development for resale | 11,000,000.0 | 14,200,000 | 20,900,000 | 28,500,000 |  |  |
Amortization expense of capitalized software development costs | 14,600,000 | 14,900,000 | 29,100,000 | 28,000,000.0 |  |  |
Self-insurance liability | 7,000,000.0 |  | 7,000,000.0 |  |  | 6,900,000 |
Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements | 1,284,000 | 346,000 | 1,742,000 | 747,000 |  |  |
Stock-based compensation expense | 21,000,000.0 | 22,400,000 | 43,241,000 | 43,328,000 |  |  |
Benefit from income taxes | 2,874,000 | $ 687,000 | $ 6,961,000 | $ 6,435,000 |  |  |
Accounting Standards Update 2019-12 [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Description of new accounting pronouncements |  |  | In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2019-12, Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various areas related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in ASC 740 and also clarifies and amends existing guidance to improve consistent application. The Company adopted the new guidance in the first quarter of fiscal year 2022 on a prospective basis and as a result upon purchase of the remaining 51% interest in Euro Infrastructure Co. from Eutelsat (see Note 12 — Acquisitions for more information), and assertion to permanently reinvest future earnings, the deferred tax liability recorded for Euro Infrastructure Co.’s outside basis difference of $8.1 million was reversed and recorded in the first quarter of fiscal year 2022 as an income tax benefit in the condensed consolidated statements of operations and comprehensive income (loss). |  |  |  |
Benefit from income taxes |  |  | $ 8,100,000 |  |  |  |
Accounting Standards Update 2020-01 [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Description of new accounting pronouncements |  |  | In January 2020, the FASB issued ASU 2020-01, Investments – Equity Securities (ASC 321), Investments – Equity Method and Joint Ventures (ASC 323) and Derivatives and Hedging (ASC 815). ASU 2020-01 clarifies the interaction of the accounting for equity securities under ASC 321 and investments accounted for under the equity method of accounting under ASC 323, and the accounting for certain forward contracts and purchased options accounted for under ASC 815. The Company adopted the new guidance in the first quarter of fiscal year 2022 on a prospective basis and the guidance did not have a material impact on the Company’s consolidated financial statements and disclosures. |  |  |  |
Accounting Standards Update 2020-06 [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Description of new accounting pronouncements |  |  | In August 2020, the FASB issued ASU 2020-06, Debt – Debt with Conversion and Other Options (ASC 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by removing the beneficial conversion and cash conversion accounting models for convertible instruments and removes certain settlement conditions that are required for contracts to qualify for equity classification. This new standard also simplifies the diluted earnings per share calculations by requiring that an entity use the if-converted method for convertible instruments and requires that the effect of potential share settlement be included in diluted earnings per share calculations when an instrument may be settled in cash or shares. The new standard requires entities to provide expanded disclosures about the terms and features of convertible instruments, how the instruments have been reported in the entity’s financial statements, and information about events, conditions, and circumstances that can affect how to assess the amount or timing of an entity’s future cash flows related to those instruments. The new standard will become effective for the Company beginning in fiscal year 2023, with early adoption permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. |  |  |  |
Accounting Standards Update 2020-08 [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Description of new accounting pronouncements |  |  | In October 2020, the FASB issued ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables – Nonrefundable Fees and Other Costs. ASU 2020-08 clarifies that a company should reevaluate whether a callable debt security is within the scope of ASC paragraph 310-20-35-33 for each reporting period. The Company adopted the new guidance in the first quarter of fiscal year 2022 on a prospective basis and the guidance did not have a material impact on the Company’s consolidated financial statements and disclosures. |  |  |  |
CPE Leased Equipment [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, equipment and satellites | 405,349,000 |  | $ 405,349,000 |  |  | 409,942,000 |
Accumulated depreciation and amortization | $ 201,400,000 |  | $ 201,400,000 |  |  | 193,700,000 |
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 |  | 1 year |  |  |  |
Operating lease, remaining lease term | 1 year |  | 1 year |  |  |  |
Estimated useful life, years |  |  | 2 years |  |  |  |
Minimum [Member] | Internally Developed Software [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  | 3 years |  |  |  |
Minimum [Member] | CPE Leased Equipment [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  | 4 years |  |  |  |
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 | 5 years |  | 5 years |  |  |  |
Operating lease, remaining lease term | 12 years |  | 12 years |  |  |  |
Estimated useful life, years |  |  | 12 years |  |  |  |
Maximum [Member] | Software Development Costs [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life, years |  |  | 5 years |  |  |  |
Maximum [Member] | Internally Developed Software [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  | 7 years |  |  |  |
Maximum [Member] | CPE Leased Equipment [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  | 5 years |  |  |  |
RigNet, Inc [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Unbilled accounts receivable contributed by acquisition |  |  | $ 17,500,000 |  |  |  |
Euro​ Infrastructure​ Co Step Acquisition [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of additional interest in subsidiary acquired |  |  |  |  | 51.00% |  |
Funded Research and Development from Customer Contracts [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue | 23.00% | 23.00% | 23.00% | 25.00% |  |  |
Operating Segments [Member] | Commercial Networks and Government Systems [Member] | Fixed-price Contract [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue | 91.00% | 87.00% | 90.00% | 86.00% |  |  |
U.S. Government as an Individual Customer [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue | 25.00% | 32.00% | 27.00% | 31.00% |  |  |
Other Customers [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue | 75.00% | 68.00% | 73.00% | 69.00% |  |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accrued reserves | $ 10,900,000 |  | $ 10,900,000 |  |  | 10,300,000 |
Indemnification Agreement [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] |  |  |  |  |  |  |
Number of shares issued and sold | shares |  | 4,474,559 |  | 4,474,559 |  |  |
Stock purchase price per share | $ / shares |  |  |  |  |  |  | $ 39.11
Common stock issued based on the vesting terms of certain restricted stock unit agreements | shares | 99,947 | 40,676 | 129,007 | 64,970 |  |  |
Common Stock Held in Treasury [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Shares of common stock outstanding | shares | 0 |  | 0 |  |  | 0 |
Purchase of treasury shares pursuant to vesting of certain RSU agreements | shares | 24,617 | 8,367 | 33,338 | 16,915 |  |  |
Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements | $ 1,300,000 |  | $ 1,700,000 |  |  |  |

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