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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025	Feb. 20, 2025	Jul. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	100,000,000		100,000,000		100,000,000
Treasury Stock Acquired, Average Cost Per Share		$ 172.80		$ 172.80
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			47,603	38,744
Share Repurchase Program, Authorized, Amount							$ 200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	1,299,355		1,299,355
Contingent consideration	$ 129	$ 339	$ 258	$ 678
Treasury Stock Acquired, Average Cost Per Share		$ 172.80		$ 172.80
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			47,603	38,744
Residential [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contingent consideration	0	$ 0	$ 0	$ 0
Infrastructure Solutions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contingent consideration	129	339	258	678
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	132	159	290	319
us-gaap_PhantomShareUnitsPSUsMember_Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 3,366	2,980	$ 6,935	$ 4,766
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period			15,680
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period			2,566
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period			(121,010)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number	198,859		198,859		306,755
Stock Issued During Period, Shares, Treasury Stock Reissued			121,139	94,752
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period			2,566
Common Stock, par value $0.01 per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 52	$ 0	$ 91	$ 0
Repurchase Agreements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired		118,314	4,112	118,314
Amended Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized						750,000