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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Jul. 31, 2024	Dec. 01, 2022	Sep. 30, 2022	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	1,265,801
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	94,799	104,600
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	38,744	40,308
Options exercised, shares		2,500	3,000
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	$ 3,371,468	$ 2,884,358	$ 2,377,227
Residential [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues	1,304,369	1,388,840	1,279,504
Single Family Plumbing HVAC | Residential [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues	325,798	324,911	$ 243,885
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)
Share-based Payment Arrangement, Expense	0	$ 0	$ 23
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
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			(13,373)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 461
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 676	$ 495	$ 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	(2,393)
Shares, Issued	103,599
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	(94,752)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 118.04	$ 47.72
Shares, Outstanding	306,755	300,301
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 248.33
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	38.50
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 83.73
Phantom Share Units, Employee PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 12,255	$ 5,037	$ 3,963
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
Repurchase Agreements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	173,262	289,284
Treasury Stock Acquired, Average Cost Per Share	$ 174.25	$ 136.34

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