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Supplemental Statement of Operations Information (Tables)
 12 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Restructuring and Related Costs
Activity in accrued restructuring, reported within Other current liabilities, is presented below:
202520242023
(in millions)
Balance at beginning of year$3.4 $6.6 $3.3 
   Expenses incurred8.8 15.8 10.2 
   Amounts paid and other adjustments, net(11.1)(19.0)(6.9)
Balance at end of year$1.1 $3.4 $6.6 
Selected Supplemental Statement of Operations Information
Selected supplemental statement of operations information is presented below:

202520242023
(in millions)
Included in selling, general and administrative expenses:
Research and development$19.9 $20.5 $25.9 
Advertising$4.6 $5.8 $4.7 
Interest expense, net:
4.0% Senior Notes$18.0 $18.0 $18.0 
Deferred financing costs amortization1.0 1.0 1.0 
ABL Agreement0.8 0.9 0.9 
   Capitalized interest(0.5)(0.1)(1.6)
Other interest expense0.7 1.7 0.1 
Total interest expense20.0 21.5 18.4 
Interest income(13.4)(8.8)(3.7)
Net interest expense$6.6 $12.7 $14.7