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Intangible Assets
 3 Months Ended
Dec. 31, 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):
 December 31, 2024September 30, 2024
Gross AmountAccumulated
Amortization		Net AmountGross AmountAccumulated
Amortization		Net Amount
Intangible assets subject to amortization
Trade/domain names and other licenses$6.7 $(3.4)$3.3 $4.1 $(3.2)$0.9 
Software programs/platforms2.3 (1.5)0.8 4.9 (4.1)0.8 
Client and supplier base24.0 (12.6)11.4 37.7 (25.6)12.1 
Total intangible assets subject to amortization33.0 (17.5)15.5 46.7 (32.9)13.8 
Intangible assets not subject to amortization
Website domains2.0 — 2.0 2.1 — 2.1 
Business licenses3.7 — 3.7 3.7 — 3.7 
Total intangible assets not subject to amortization5.7 — 5.7 5.8 — 5.8 
Total intangible assets$38.7 $(17.5)$21.2 $52.5 $(32.9)$19.6 
Amortization expense related to intangible assets was $1.1 million and $2.0 million for the three months ended December 31, 2024 and 2023, respectively.

The Company wrote off $16.2 million of fully amortized intangible assets during the three months ended December 31, 2024.
As of December 31, 2024, estimated future amortization expense was as follows:
(in millions) 
Fiscal 2025 (remaining months)$3.3 
Fiscal 20263.7 
Fiscal 20273.0 
Fiscal 20282.1 
Fiscal 2029 and thereafter3.4 
Total intangible assets subject to amortization$15.5