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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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