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Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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May 31, 2021 USD ($) shares | Mar. 31, 2015 | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) shares | Mar. 31, 2022 | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Dec. 31, 2018 $ / shares | Jan. 01, 2025 | Jan. 01, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation, net of capitalized amounts |  |  | $ 24,000 | $ 24,000 |  | $ 74,000 | $ 69,000 |  |  |
Unrecognized compensation expense |  |  | 191,000 |  |  | $ 191,000 |  |  |  |
Unrecognized compensation expense, period for recognition |  |  |  |  |  | 2 years 4 months 24 days |  |  |  |
Automatic annual increase lesser of, percent of common stock |  |  |  |  |  |  |  |  | 2.00% | 2.00%
Conversion ratio |  |  |  |  |  | 1.25 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation, net of capitalized amounts |  |  | 1,000 | 1,000 |  | $ 2,000 | 1,000 |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation, net of capitalized amounts |  |  | $ 24,000 | $ 23,000 |  | $ 74,000 | $ 70,000 |  |  |
Class A Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of units granted in the period (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 18.58 |  |
Conversion ratio |  |  |  |  | 0.8 |  |  |  |  |
Class B Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion ratio |  | 0.8 |  |  |  |  |  |  |  |
Number of units granted in the period (in shares) | shares |  |  | 0 | 0 |  | 0 | 0 |  |  |
Minimum | Class A Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Service-based vesting period |  |  |  |  |  |  |  | 2 years |  |
Minimum | Class B Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Service-based vesting period |  | 4 years |  |  |  |  |  |  |  |
Participation threshold (in dollars per share) | $ / shares |  |  |  |  |  | $ 0 |  |  |  |
Maximum | Class A Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Service-based vesting period |  |  |  |  |  |  |  | 4 years |  |
Maximum | Class B Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Service-based vesting period |  | 5 years |  |  |  |  |  |  |  |
Participation threshold (in dollars per share) | $ / shares |  |  |  |  |  | $ 12 |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  | 0.8 |  |  |  |
2017 Omnibus Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Automatic annual increase lesser of, percent of common stock |  |  | 2.00% |  |  | 2.00% |  |  |  |
2017 Omnibus Incentive Plan | Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) | shares |  |  | 20,000,000 |  |  | 20,000,000 |  |  |  |
Employee Stock Purchase Plan | Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation, net of capitalized amounts |  |  | $ 1,000 | $ 1,000 |  | $ 1,000 | $ 1,000 |  |  |
Number of shares available for grant (in shares) | shares |  |  | 364,756 |  |  | 364,756 |  |  |  |
Employee Stock Purchase Plan | Class A Common Stock | Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
ESPP, purchase period | 6 months |  |  |  |  |  |  |  |  |
ESPP purchase price of common stock, percent of fair market value | 90.00% |  |  |  |  |  |  |  |  |
Maximum number of awards authorized for grant (in shares) | shares | 500,000 |  |  |  |  |  |  |  |  |
ESPP, number of shares issued (in shares) | shares |  |  |  |  |  | 3,212 | 6,136 |  |  |
Employee Stock Purchase Plan | Class A Common Stock | Employee Stock | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
ESPP, contribution amount | $ 10 |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan | Class A Common Stock | Employee Stock | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
ESPP, contribution amount | $ 25 |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense capitalized |  |  | $ 2,000 | 2,000 |  | $ 6,000 | $ 7,000 |  |  |
Inventory Net |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense capitalized |  |  | $ 1,000 | $ 1,000 |  | $ 3,000 | $ 2,000 |  |  |

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