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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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