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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Jul. 31, 2024 | Dec. 01, 2022 | Sep. 30, 2021 | May 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized | 100,000,000 | 100,000,000 |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 581,169 |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 1,500,000 |  |  |  |  |  | 1,000,000.0
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 104,600 | 105,755 |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 40,308 | 32,158 |  |  |  |  |
Options exercised, shares | 2,500 | 3,000 | 9,000 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 200,000 | $ 40,000 |  |
Common Stock, Shares, Issued | 22,049,529 | 22,049,529 | 22,049,529 |  |  | 22,049,529 |
Revenues | $ 2,884,358 | $ 2,377,227 | $ 2,166,808 |  |  |  |
Residential [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Revenues | 1,388,840 | 1,279,504 | 1,131,414 |  |  |  |
Single Family Plumbing HVAC | Residential [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Revenues | 324,911 | $ 243,885 | $ 164,903 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | (266) | 0 |  |  |  |
Share-based Payment Arrangement, Expense | 0 | $ 23 | $ 137 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 0 | 13,639 | 16,757 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 0 | 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | (13,373) | (3,118) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 0 | 13,639 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 461 | $ 150 |  |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 495 | $ 386 | 386 |  |  |  |
Performance Based Phantom Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | (12,496) |  |  |  |  |  |
Shares, Issued | 86,563 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | (99,579) |  |  |  |  |  |
Shares, Outstanding | 300,301 | 325,813 |  |  |  |  |
Phantom Share Units, Employee PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 5,037 | $ 3,963 | $ 3,251 |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 56 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 2,500 | 3,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 0 |  |  |  |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized | 3,000,000.0 |  |  |  |  |  |
Repurchase Agreements |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 289,284 | 224,013 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 136.34 | $ 31.06 |  |  |  |  |

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