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Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2021 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Balance	$ 122,117
Balance	141,116
Wireless Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance	122,117
Acquisitions	8,769
Exchanges - broadband licenses received	13,611
Exchanges - narrowband licenses surrendered	(3,381)
Balance	$ 141,116

X

- Definition

Indefinite lived Intangible Assets, Exchanges, Received

+ References

No definition available.

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- Definition

Indefinite lived Intangible Assets, Exchanges, Surrendered

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- 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.

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