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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, license in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 USD ($) license segment $ / shares shares | Mar. 31, 2025 USD ($) license shares
Summary Of Significant Accounting Policies [Line Items] |  |
Number of reportable segments | segment | 1 |
Number of operating segments | segment | 1 |
Asset retirement obligation, liabilities settled | $ (410,000) | $ (5,000)
Decrease in asset retirement obligations accrual | $ (110,000) | (112,000)
Wireless licenses term | 10 years |
Impairment charges | $ 0 | $ 0
Broadband license, held-for-sale, term | 1 year |
Broadband license, held-for-sale | license | 0.0 | 0.0
Impairment of long-lived assets | $ 0 | $ 0
Tax benefits attributed to share-based compensation expense | $ 0 |
Potentially dilutive securities outstanding but excluded from computation of earnings per share | shares | 1,975,287 | 221,802
Stock Options |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Award expiration period | 10 years |
Award requisite service period | 3 years |
Dividend yield | 0.00% | 0.00%
Stock Options | Grants Prior to July 2023 |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Award requisite service period | 4 years |
Restricted Stock |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Dividend yield | 0.00% |
Advertising |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Advertising and promotional expense | $ 56,000 | $ 100,000
Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Lease extension | 3 years |
Accelerated vesting provision, change in control, purchase price (in dollars per share) | $ / shares | $ 100 |
Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Lease extension | 10 years |
Sales Revenue, Services, Net | Each Customer | Customer Concentration Risk |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 10.00% | 10.00%

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