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The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail 6) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Company And Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in collections in excess of revenues and deferred revenues	$ 128.1
Increase (decrease) in unbilled accounts receivable	51.4
Collections in excess of revenues and deferred revenues, recognized revenue	$ 97.8	$ 115.1
Funded Research and Development from Customer Contracts [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	12.00%	16.00%	18.00%
Other Customers [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	83.00%	83.00%	82.00%
U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	17.00%	17.00%	18.00%
Satellite Services [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in collections in excess of revenues and deferred revenues	$ (13.4)
Increase (decrease) in deferred revenues, long-term portion	$ (50.8)
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%	91.00%
Inmarsat Holdings [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in unbilled accounts receivable	$ 16.3
Increase (decrease) in collections in excess of revenues and deferred revenues	141.5
Increase (decrease) in deferred revenues, long-term portion	$ 862.5