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Intangible Assets
 12 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The Company recorded $3.6 million of customer list assets and wrote off $27.8 million of fully amortized intangible assets during the fiscal year ended September 30, 2024.
The Company recorded $8.5 million of customer list assets and $0.4 million of trade name assets related to the acquisition of CDI during the fiscal year ended September 30, 2023.
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, 2024September 30, 2023
Gross
Amount		Accumulated
Amortization		Net AmountGross
Amount		Accumulated
Amortization		Net Amount
Intangible assets subject to amortization:
Trade/domain names$4.1 $(3.2)$0.9 $4.1 $(2.4)$1.7 
Software programs/platforms4.9 (4.1)0.8 28.5 (26.9)1.6 
Client base37.7 (25.6)12.1 38.3 (24.1)14.2 
Total intangible assets subject to amortization46.7 (32.9)13.8 70.9 (53.4)17.5 
Intangible assets not subject to amortization
Website domains2.1 — 2.1 1.9 — 1.9 
Business licenses3.7 — 3.7 3.7 — 3.7 
Total intangible assets not subject to amortization5.8 — 5.8 5.6 — 5.6 
Total intangible assets$52.5 $(32.9)$19.6 $76.5 $(53.4)$23.1 
Amortization expense related to intangible assets was $7.5 million, $14.7 million, and $14.4 million for the years ended September 30, 2024, 2023, and 2022, respectively.
As of September 30, 2024, estimated future amortization expense was as follows:
(in millions) 
Fiscal 2025$4.1 
Fiscal 20263.1 
Fiscal 20272.4 
Fiscal 20281.5 
Fiscal 2029 and thereafter2.7 
$13.8