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Intangible Assets
 12 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The Company recorded approximately $420.9 million of client base assets and $6.5 million of trade/domain name and other license assets related to various acquisitions during the fiscal year ended September 30, 2025, further discussed in Note 20. The Company wrote off $16.2 million of fully amortized intangible assets during the fiscal year ended September 30, 2025.
The Company recorded $3.6 million of client base assets and wrote off $27.8 million of fully amortized intangible assets during the fiscal year ended September 30, 2024.
The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions):
 September 30, 2025September 30, 2024
Gross
Amount		Accumulated
Amortization		Net AmountGross
Amount		Accumulated
Amortization		Net Amount
Intangible assets subject to amortization:
Trade/domain names and other licenses$10.6 $(4.9)$5.7 $4.1 $(3.2)$0.9 
Software programs/platforms2.4 (2.0)0.4 4.9 (4.1)0.8 
Client base445.0 (19.2)425.8 37.7 (25.6)12.1 
Total intangible assets subject to amortization458.0 (26.1)431.9 46.7 (32.9)13.8 
Intangible assets not subject to amortization
Website domains2.3 — 2.3 2.1 — 2.1 
Business licenses3.7 — 3.7 3.7 — 3.7 
Total intangible assets not subject to amortization6.0 — 6.0 5.8 — 5.8 
Total intangible assets$464.0 $(26.1)$437.9 $52.5 $(32.9)$19.6 
Amortization expense related to intangible assets was $9.5 million, $7.5 million, and $14.7 million for the years ended September 30, 2025, 2024, and 2023, respectively.
As of September 30, 2025, estimated future amortization expense was as follows:
(in millions) 
Fiscal 2026$31.9 
Fiscal 202728.9 
Fiscal 202827.8 
Fiscal 202927.0 
Fiscal 2030 and thereafter316.3 
$431.9