v3.25.4
Segments (Segment Reporting Information - Geographic Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]      
Assets $ 4,443.6   $ 4,556.7
Long lived tangible assets 838.2   820.9
Net sales 778.9 $ 731.7  
Depreciation and amortization 31.6 31.8  
Amortization of intangible assets 14.0 14.7  
U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long lived tangible assets 576.0   589.7
Net sales 376.7 401.4  
Singapore      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long lived tangible assets 65.4   41.8
Indonesia      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long lived tangible assets 38.1   39.2
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long lived tangible assets 51.9   54.0
Other International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long lived tangible assets 106.8   $ 96.2
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 402.2 $ 330.3