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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2022 | Jan. 01, 2021 | Sep. 15, 2014 | May 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2022 | Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of increase in number of shares of common stock issued and outstanding |  |  |  |  |  |  | 5.00% |  |  |
Number of shares repurchased (in shares) |  |  |  | 20,132 | 54,000 | 0 | 110,000 | 0 |  |
Shares repurchased |  |  |  | $ 1,000 |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 50,000 |  | $ 50,000 |  |
Stock repurchase program, remaining repurchase amount |  |  |  |  | $ 30,300 |  | $ 30,300 |  |  |
Shares issued on conversion (in shares) | 500,000 |  |  |  |  |  |  |  |  |
Shares converted (in shares) | 500,000 |  |  |  |  |  |  |  |  |
Common Class B | 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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
2014 Stock Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock authorized and reserved for issuance (in shares) |  |  |  |  | 5,027,201 |  | 5,027,201 |  |  |
Shares available (in shares) |  |  |  |  | 744,105 |  | 744,105 |  |  |
Percentage of increase in number of shares of common stock issued and outstanding |  | 5.00% |  |  |  |  |  |  |  |
Additional common stock authorized and reserved for future issuance (in shares) |  | 879,216 |  |  |  |  |  |  |  |
Awards issued (in shares) |  |  |  |  |  |  | 192,325 |  | 979,320 |

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