Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in the Company's Goodwill

A summary of changes in the Company’s goodwill during the fiscal years ended September 30, 2025 and 2024 are as follows (in thousands):

Balance as of September 30, 2023	$	262,103
Fiscal year 2024 business combinations		13,726
Balance as of September 30, 2024		275,829
Fiscal year 2025 business combinations		17,715
Other		(194	)
Balance as of September 30, 2025	$	293,350

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following (in thousands):

	September 30,
	2025						2024
	Gross						Gross
	Carrying		Accum.				Carrying		Accum.
	Amount		Amortization		Net		Amount		Amortization		Net
Customer lists	$	493,431	$	391,702	$	101,729	$	452,340	$	373,860	$	78,480
Trade names and other intangibles		52,028		28,865		23,163		46,895		26,663		20,232
Total	$	545,459	$	420,567	$	124,892	$	499,235	$	400,523	$	98,712

Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization

Total estimated annual amortization expense related to intangible assets subject to amortization, for the year ending September 30, 2026 and the four succeeding fiscal years ending September 30, is as follows (in thousands):

	Amount
2026	$	18,761
2027	$	18,061
2028	$	15,916
2029	$	14,533
2030	$	12,618