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Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 202,044
Ending balance	216,743	$ 202,044
Wireless Licenses
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	202,044	151,169
Acquisitions and transfers	12,077	12,476
Sale of intangible assets	(32,402)	0
Exchanges - licenses received	43,700	46,174
Exchanges - licenses surrendered	(8,676)	(7,775)
Ending balance	$ 216,743	$ 202,044

X

- Definition

Indefinitelived Intangible Assets, Exchanged Licenses Received

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Indefinitelived Intangible Assets, Exchanged Licenses Surrendered

+ References

No definition available.

+ Details

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X

- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of divestiture of an asset lacking physical substance and having a projected indefinite period of benefit to fair value. Excludes financial assets and goodwill.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

+ References

No definition available.

+ Details

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