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Intangible Assets
 9 Months Ended
Jun. 30, 2025
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, 2025September 30, 2024
Gross AmountAccumulated
Amortization		Net AmountGross AmountAccumulated
Amortization		Net Amount
Intangible assets subject to amortization
Trade/domain names and other licenses$7.7 $(4.2)$3.5 $4.1 $(3.2)$0.9 
Software programs/platforms2.4 (1.9)0.5 4.9 (4.1)0.8 
Client and supplier base25.3 (14.2)11.1 37.7 (25.6)12.1 
Total intangible assets subject to amortization35.4 (20.3)15.1 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$41.4 $(20.3)$21.1 $52.5 $(32.9)$19.6 
Amortization expense related to intangible assets was $1.3 million and $1.9 million for the three months ended June 30, 2025 and 2024, respectively. Amortization expense related to intangible assets was $3.6 million and $6.0 million for the nine months ended June 30, 2025 and 2024, respectively.
The Company wrote off $16.2 million of fully amortized intangible assets during the nine months ended June 30, 2025.
As of June 30, 2025, estimated future amortization expense was as follows:
(in millions) 
Fiscal 2025 (remaining months)$1.1 
Fiscal 20264.1 
Fiscal 20273.4 
Fiscal 20282.3 
Fiscal 2029 and thereafter4.2 
Total intangible assets subject to amortization$15.1