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Intangible Assets
 9 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
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):
 June 30, 2024September 30, 2023
Gross AmountAccumulated
Amortization		Net AmountGross AmountAccumulated
Amortization		Net Amount
Intangible assets subject to amortization
Trade/domain names$4.1 $(3.0)$1.1 $4.1 $(2.4)$1.7 
Software programs/platforms4.8 (3.8)1.0 28.5 (26.9)1.6 
Client and supplier base34.8 (24.5)10.3 38.3 (24.1)14.2 
Total intangible assets subject to amortization43.7 (31.3)12.4 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$49.5 $(31.3)$18.2 $76.5 $(53.4)$23.1 
Amortization expense related to intangible assets was $1.9 million and $3.9 million for the three months ended June 30, 2024 and 2023, respectively. Amortization expense related to intangible assets was $6.0 million and $11.9 million for the nine months ended June 30, 2024 and 2023, respectively.
The Company wrote off $27.8 million of fully amortized intangible assets during the nine months ended June 30, 2024.
As of June 30, 2024, estimated future amortization expense was as follows:
(in millions) 
Fiscal 2024 (remaining months)$1.2 
Fiscal 20253.7 
Fiscal 20262.9 
Fiscal 20272.2 
Fiscal 2028 and thereafter2.4 
Total intangible assets subject to amortization$12.4