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Stock Compensation - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 01, 2021 | Jun. 24, 2020 | Jan. 31, 2025 | Oct. 31, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available (in shares) |  |  |  |  | 762,367 |  |
General and administrative |  |  |  |  | $ 36,063,000 | $ 42,671,000 |
Product development |  |  |  |  | 4,703,000 | 5,735,000 |
Sales and support |  |  |  |  | 6,900,000 | 6,110,000 |
Stock compensation expense (reversal) |  |  |  |  | 11,491,000 | 13,531,000 |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 250,000,000.0
Excise tax expense |  |  |  |  | 0 | 0 |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  | $ 226,700,000 |  |
President and Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Measurement period |  |  |  |  | 2 years |  |
Stock or unit option plan expense |  |  |  |  |  | 1,100,000 |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 4,600,000 | 7,900,000 |
General and administrative |  |  |  |  | 3,600,000 | 7,500,000 |
Product development |  |  |  |  | 600,000 | 200,000 |
Sales and support |  |  |  |  | 400,000 | 200,000 |
Unvested compensation expense |  |  |  |  | $ 3,300,000 | $ 6,000,000.0 |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 9 months | 1 year 3 months 3 days |
Awards issued (in shares) |  |  |  |  | 195,652 | 269,799 |
Vested in period (in shares) |  |  |  |  | 175,016 |  |
Awards issued |  |  |  |  | 153,001 |  |
Performance-Based Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 0 | $ 500,000 |
Unvested compensation expense |  |  |  |  |  | $ 1,700,000 |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  |  | 2 years 6 months 3 days |
Awards issued (in shares) |  |  |  |  | 0 | 0 |
Annual compound growth rate used to calculate stock price levels | 4 years |  |  |  |  |  |
Common stock trading day period | 60 days |  |  |  |  |  |
Performance-Based Restricted Stock Units | President and Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  | 33,417 |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Measurement period |  | 4 years |  |  |  |  |
Vesting if target metric achieved (in shares) |  | 30,049 |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  | 15,800 |
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Minimum |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
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 | 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 | 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% |  |  |  |  |  |
Unvested Time-Based | President and Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards issued (in shares) |  |  |  |  |  | 68,788 |
Performance Based Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards issued |  |  |  | 97,631 |  |  |
Incremental fair value |  |  |  |  |  | $ 1,400,000 |
Incremental fair value immediately |  |  |  |  |  | 100,000 |
Time Based Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards issued |  |  | 191,326 |  |  |  |
Contractual life |  |  |  | 10 years |  |  |
Time Based Stock Options | First Anniversary |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of vesting for stock granted to employees |  |  |  | 33.00% |  |  |
Time Based Stock Options | Second Anniversary |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of vesting for stock granted to employees |  |  |  | 33.00% |  |  |
Time Based Stock Options | Third Anniversary |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of vesting for stock granted to employees |  |  |  | 33.00% |  |  |
Service-Based Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 7,000,000.0 | $ 4,500,000 |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
General and administrative |  |  |  |  | 6,800,000 |  |
Product development |  |  |  |  | 200,000 |  |
Sales and support |  |  |  |  | $ 20,000 |  |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 1 month 28 days | 2 years 6 months 3 days |
Intrinsic value of options exercised |  |  |  |  | $ 900,000 | $ 2,900,000 |
Weighted average grant-date fair value per option granted (in dollars per share) |  |  |  |  | $ 38.59 | $ 31.31 |
Unrecognized compensation cost related to non-vested share options granted |  |  |  |  | $ 5,800,000 | $ 10,200,000 |
Performance-Based Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested compensation expense |  |  |  |  | $ 300,000 |  |
Weighted average period of recognition of unrecognized compensation cost |  |  |  |  | 1 year 6 months 3 days |  |
Share-based compensation arrangement by share-based payment award, stock price period for award vesting |  |  |  |  |  | 60 days |
Share-based compensation arrangement by share-based payment award, target award vesting percentage |  |  |  |  |  | 100.00% |
Stock compensation expense (reversal) |  |  |  |  | $ (100,000) | $ 600,000 |
Performance-Based Stock Options | Senior Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Contractual life |  |  |  | 10 years |  |  |
Incremental fair value |  |  |  |  |  | 1,000,000.0 |
Incremental fair value immediately |  |  |  |  |  | $ 100,000 |
Performance-based stock options (in shares) |  |  |  | 213,487 |  |  |
2023 Stock Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock authorized and reserved for issuance (in shares) |  |  |  |  | 1,350,000 |  |

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