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Stock Compensation - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended | 31 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 30, 2022 | Feb. 01, 2021 | Jun. 24, 2020 | Sep. 15, 2014 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Sep. 21, 2023 | Aug. 08, 2023 | Jun. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available (in shares) |  |  |  |  | 200,651 |  | 200,651 |  |  |  |
General and administrative |  |  |  |  | $ 44,423,000 | $ 45,177,000 |  |  |  |  |
Product development |  |  |  |  | 5,697,000 | 4,439,000 |  |  |  |  |
Sales and support |  |  |  |  | 5,693,000 | 5,733,000 |  |  |  |  |
Stock compensation expense |  |  |  |  | 15,507,000 | 17,874,000 |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 250,000,000 |  |  | $ 50,000,000
Retirement of common stock |  |  |  |  | 24,676,000 | 8,223,000 | $ 33,900,000 |  |  |  |
Excise taxes collected |  |  |  |  | 200,000 |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  | 236,100,000 |  | 236,100,000 |  |  |  |
Sale of stock (in shares) | 500,000 |  |  |  |  |  |  |  |  |  |
Common Class B Units | PDV Spectrum Holding Company, LLC |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investee, cumulative proceeds received on all transactions |  |  |  | $ 10,000,000 |  |  |  |  |  |  |
Sale of stock (in shares) |  |  |  | 500,000 |  |  |  |  |  |  |
Sale of stock (in dollars per share) |  |  |  | $ 20.00 |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of units owned |  |  |  | 100.00% |  |  |  |  |  |  |
Shares registered for resale (in shares) |  |  |  |  |  |  |  |  |  | 500,000 |
Common Class A | PDV Spectrum Holding Company, LLC |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary equity units for which investor has right to convert to common stock (in shares) |  |  |  | 500,000 |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | 9,900,000 | 10,900,000 |  |  |  |  |
General and administrative |  |  |  |  | 9,100,000 | 9,800,000 |  |  |  |  |
Product development |  |  |  |  | 400,000 | 600,000 |  |  |  |  |
Sales and support |  |  |  |  | 400,000 | 500,000 |  |  |  |  |
Unvested compensation expense |  |  |  |  | $ 14,400,000 | $ 18,500,000 | 14,400,000 |  |  |  |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 11 months 1 day | 2 years 3 months 21 days |  |  |  |  |
Performance-Based Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 800,000 | $ 1,300,000 |  |  |  |  |
Unvested compensation expense |  |  |  |  | $ 300,000 | $ 2,500,000 | $ 300,000 |  |  |  |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 2 months 23 days | 1 year 8 months 15 days |  |  |  |  |
Annual compound growth rate used to calculate stock price levels |  | 4 years |  |  |  |  |  |  |  |  |
Common stock trading day period |  | 60 days |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Measurement period |  |  | 4 years |  |  |  |  |  |  |  |
Vesting if target metric achieved (in shares) |  |  | 30,049 |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share payout |  |  |  |  | 0.00% |  |  |  |  |  |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Minimum | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting if target metric achieved (in shares) |  |  | 15,025 |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Maximum | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share payout |  |  |  |  | 200.00% |  |  |  |  |  |
Vesting if target metric achieved (in shares) |  |  | 60,098 |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | TSR | President and Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting if target metric achieved (in shares) |  | 45,000 |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | TSR | Minimum | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share payout |  |  |  |  | 25.00% |  |  |  |  |  |
Performance-Based Restricted Stock Units | TSR | Minimum | President and Chief Executive Officer | First Anniversary |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of vesting for stock granted to employees |  | 25.00% |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Units | TSR | Maximum | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share payout |  |  |  |  | 350.00% |  |  |  |  |  |
Performance-Based Restricted Stock Units | TSR | Maximum | President and Chief Executive Officer | First Anniversary |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of vesting for stock granted to employees |  | 350.00% |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 5 months 8 days | 1 year 8 months 4 days |  |  |  |  |
Options, outstanding, contingently issued (in shares) |  |  |  |  | 85,000 |  | 85,000 |  |  |  |
Intrinsic value of options exercised |  |  |  |  | $ 1,300,000 | $ 1,200,000 |  |  |  |  |
Weighted average grant-date fair value per option granted (in dollars per share) |  |  |  |  | $ 36.10 | $ 49.39 |  |  |  |  |
Unrecognized compensation cost related to non-vested share options granted |  |  |  |  | $ 8,200,000 | $ 7,400,000 | $ 8,200,000 |  |  |  |
Stock options outstanding |  |  |  |  | 1,617,886 | 1,402,949 | 1,617,886 |  |  |  |
Service-Based Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 4,800,000 | $ 5,600,000 |  |  |  |  |
Performance-Based Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unvested compensation expense |  |  |  |  | 0 | 0 | $ 0 |  |  |  |
Stock compensation expense |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
Stock options outstanding |  |  |  |  | 33,782 | 33,782 | 33,782 |  |  |  |
2014 Stock Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available (in shares) |  |  |  |  | 388,151 |  | 388,151 |  |  |  |
2014 Stock Plan | Performance-Based Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock authorized and reserved for issuance (in shares) |  |  |  |  | 181,887 |  | 181,887 |  |  |  |
2023 Stock Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock authorized and reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 250,000 |  |
Retirement of common stock |  |  |  |  | $ 13,900,000 |  |  |  |  |  |
2023 Stock Plan | Performance-Based Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance threshold, percentage |  |  |  |  | 100.00% |  |  |  |  |  |
2021 Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock |  |  |  |  | $ 10,700,000 |  |  |  |  |  |

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