The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail)		12 Months Ended
	Aug. 12, 2022 USD ($)	Mar. 31, 2023 USD ($) Segment shares	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($) shares	Oct. 01, 2022 USD ($)	Jun. 24, 2022	Mar. 04, 2022 USD ($)	Apr. 30, 2021
Company And Summary Of Significant Accounting Policies [Line Items]
Capitalized interest expense		$ 159,700,000	$ 102,100,000	$ 81,000,000.0
Payments for repurchase of common stock		30,000,000
Deposits required by certain counterparties as collateral pursuant to outstanding letters of credits		30,532,000
Total capitalized costs related to patents		3,700,000	3,500,000
Total capitalized costs related to orbital slots and other licenses		77,000,000.0	64,100,000
Accumulated amortization of patents, orbital slots and other licenses		6,800,000	5,400,000
Patents, orbital slots and other licenses amortization expense		1,500,000	1,100,000
Debt issuance costs capitalized		0	7,800,000	5,100,000
Capitalized costs, net, related to software developed for resale		222,155,000	217,159,000
Capitalized cost related to software development for resale		59,400,000	42,700,000
Amortization expense of capitalized software development costs		54,400,000	56,500,000	56,200,000
Goodwill and other intangible assets impairment		$ 0	0	0
Maximum warranty periods provided on limited warranty		5 years
Self-insurance liability		$ 7,900,000	$ 5,800,000
Shares of common stock outstanding | shares		76,912,016	74,428,816
Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements		$ 16,493,000	$ 22,969,000	13,676,000
Other comprehensive income (loss) related to effects of foreign currency translation adjustments before tax			37,300,000	(20,400,000)
Foreign currency translation adjustments, net of tax		$ (13,092,000)	$ (31,424,000)	$ 15,851,000
Revenue, practical expedient, financing component		true	true	true
Remaining performance obligations		$ 1,700,000,000
Number of reportable segments | Segment		3
Increase (decrease) in unbilled accounts receivable		$ 19,500,000
Collections in excess of revenues and deferred revenues, recognized revenue		115,100,000	$ 171,900,000
Capitalized contract cost amortization and reduction of carrying value associated with contract termination		$ 48,200,000	$ 56,500,000	$ 50,100,000
Revenue, practical expedient, incremental cost of obtaining contract [true false]		true	true	true
Advertising costs		$ 22,800,000	$ 23,100,000	$ 12,000,000.0
(Provision for) benefit from income taxes from continuing operations		49,418,000	$ (36,517,000)	$ (11,194,000)
Letter of Credit [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Principal amount of debt		150,000,000.0
Deposits required by certain counterparties as collateral pursuant to outstanding letters of credits		30,500,000
Link-16 Tactical Data Link Business [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Disposal consideration					$ 1,960,000,000
EBI Step Acquisition [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of additional interest purchased in subsidiary acquired			51.00%					51.00%
Prepaid Expenses and Other Current Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs		19,800,000	$ 24,000,000.0
Other Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs		61,700,000	60,100,000
Deferred Customer Contract Acquisition Costs [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs		31,500,000	49,100,000
Deferred Customer Contract Fulfillment Costs [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs		$ 50,000,000.0	$ 35,000,000.0
Accounting Standards Update 2020-06 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In August 2020, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 Company adopted the new guidance in the first quarter of fiscal year 2023 and the guidance did not have a material impact on the Company's consolidated financial statements and disclosures.
Accounting Standards Update 2021-08 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In October 2021, the FASB issued ASU 2021-08, Business Combinations (ASC 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. ASU 2021-08 requires contract assets and contract liabilities acquired in a business combination to be recognized in accordance with ASC 606 as if the acquirer had originated the contracts. The new standard will become effective for the Company beginning in fiscal year 2024, with early adoption permitted. The impact of the new standard on the Company's consolidated financial statements and related disclosures will depend on the magnitude of future business combinations.
Accounting Standards Update 2021-10 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In November 2021, the FASB issued ASU 2021-10, Government Assistance (ASC 832): Disclosures by Business Entities about Government Assistance. ASU 2021-10 requires annual disclosures when an entity accounts for a transaction with a government by applying a grant or contribution accounting model by analogy to other accounting guidance. The Company adopted the new standard prospectively in fiscal year 2023. See Note 1 — The Company and a Summary of Its Significant Accounting Policies — Revenue recognition for disclosures related to these types of arrangements.
Accounting Standards Update 2022-01 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In March 2022, the FASB issued ASU 2022-01, Derivatives and Hedging (ASC 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2022-01 made targeted improvements to the optional hedge accounting model with the objective of improving hedge accounting to better portray the economic results of an entity’s risk management activities in its financial statements. The new standard will become effective for the Company beginning in fiscal year 2024. The adoption of ASU 2022-01 is not expected to have a material impact on the Company's consolidated financial statements.
Accounting Standards Update 2022-02 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In March 2022, the FASB issued ASU 2022-02, Financial Instruments – Credit Losses (ASC 326): Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings by creditors in Subtopic 310-40, Receivables – Troubled Debt Restructurings by Creditors, while enhancing certain disclosure requirements for loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Furthermore, it requires that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments – Credit Losses – Measured at Amortized Cost. The new standard will become effective for the Company beginning in fiscal year 2024. The adoption of ASU 2022-02 is not expected to have a material impact on the Company's consolidated financial statements and disclosures.
Accounting Standards Update 2022-03 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (ASC 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. ASU 2022-03 clarifies that a contractual restriction on the sale of an equity security is not considered in measuring the security's fair value. The standard also requires certain disclosures for equity securities that are subject to contractual restrictions. The new standard will become effective for the Company beginning in fiscal year 2025. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures.
Accounting Standards Update 2022-04 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In September 2022, the FASB issued ASU 2022-04, Liabilities – Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations. ASU 2022-04 enhances the transparency of supplier finance programs. In each annual reporting period, the buyer in a supplier finance program is required to disclose information about the key terms of the program, the outstanding confirmed amounts, a rollforward of such amounts, and a description of where those obligations are presented in the balance sheet. In each interim reporting period, the buyer should disclose the outstanding confirmed amounts as of the end of the interim period. The new standard will become effective for the Company beginning in fiscal year 2024, except for the amendment on rollfoward information, which will become effective in fiscal year 2025. The adoption of ASU 2022-04 is not expected to have a material impact on the Company's disclosures.
Accounting Standards Update 2022-06 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (ASC 848): Deferral of the Sunset Date of Topic 848. ASU 2022-06 extends the period of time entities can utilize the reference rate reform relief guidance under ASU 2020-04 from December 31, 2022 to December 31, 2024. ASU 2020-04, Reference Rate Reform (ASC 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting provided temporary optional guidance to ease the potential accounting burden associated with the transition away from reference rates (such as the London Interbank Offered Rate). ASU 2022-06 was effective upon issuance. The Company adopted this guidance upon issuance with no impact to the Company's consolidated financial statements and disclosures.
Accounting Standards Update 2023-01 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements		In March 2023, the FASB issued ASU 2023-01, Leases (Topic 842) - Common Control Agreements. The amendments in this update that apply to public business entities clarify the accounting for leasehold improvements associated with common control leases. The new standard will become effective for the Company beginning in fiscal year 2025. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures.
Funded Research and Development from Customer Contracts [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue		16.00%	18.00%	18.00%
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%	88.00%
U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue		17.00%	18.00%	21.00%
Other Customers [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue		83.00%	82.00%	79.00%
Common Stock Held in Treasury [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Shares of common stock outstanding | shares		0	0
Purchase of treasury shares pursuant to vesting of certain RSU agreements | shares		487,111	445,257	376,884
Repurchase and immediate retirement of treasury shares pursuant to vesting of certain RSU agreements		$ 16,500,000	$ 23,000,000.0	$ 13,700,000
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		1,376,583	1,274,311	1,064,680
Indemnification Agreement [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Accrued reserves		$ 0	$ 0
Unfavorable Regulatory Action [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Accrued reserves		$ 12,900,000	$ 12,100,000
Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		2 years	2 years
Estimated useful life, years		2 years
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		38 years
Estimated useful life, years		20 years
Maximum [Member] | Software Development Costs [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life, years		5 years
Internally Developed Software [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		3 years
Internally Developed Software [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		7 years
CPE Leased Equipment [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites		$ 395,427,000	$ 395,539,000
CPE Leased Equipment [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		4 years
CPE Leased Equipment [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		5 years
Satellites [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		7 years
Satellites [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		17 years
Term Loan Facility Member
Company And Summary Of Significant Accounting Policies [Line Items]
Principal amount of debt		$ 700,000,000.0					$ 700,000,000.0
Government Contracts Concentration Risk [Member] | Sales Revenue, Net [Member] | U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		17.00%	18.00%	21.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Five Largest Customers [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		17.00%	17.00%	13.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		21.00%	16.00%
TrellisWare [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Payments for repurchase of common stock	$ 30,000,000.0
Minority interest ownership percentage by parent						60.00%