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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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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 |

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