v3.25.4
Segments (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Segment Reporting Information      
Number of Reportable Segments 4    
Net Sales $ 2,174.6 $ 1,974.7  
Cost of goods sold 1,536.1 1,379.4  
Selling, general and administrative expenses 357.3 331.6  
Interest expense, net 103.4 84.1  
Loss on extinguishment of debt, net 17.5 5.8  
Income on swaps, net (1.9) (15.4)  
Earnings before income taxes and equity method (earnings) loss 124.0 145.4  
Additions to property and intangibles 116.4 139.0  
Depreciation and amortization 152.5 120.3  
Assets 12,984.3   $ 13,528.4
Eliminations      
Segment Reporting Information      
Net Sales (2.8) 0.0  
Operating Segments      
Segment Reporting Information      
Net Sales 2,177.4 1,974.7  
Segment Profit (Loss) 301.8 257.2  
Depreciation and amortization 133.5 119.3  
Operating Segments | Cereal and granola      
Segment Reporting Information      
Net Sales 654.6 645.0  
Operating Segments | Eggs and egg products      
Segment Reporting Information      
Net Sales 589.3 559.0  
Operating Segments | Pet Food      
Segment Reporting Information      
Net Sales 360.4 408.9  
Operating Segments | Side dishes (including potato products)      
Segment Reporting Information      
Net Sales 221.5 212.6  
Operating Segments | Nut butters      
Segment Reporting Information      
Net Sales 105.8 28.1  
Operating Segments | Sausage      
Segment Reporting Information      
Net Sales 53.1 50.7  
Operating Segments | Cheese and dairy      
Segment Reporting Information      
Net Sales 41.3 42.7  
Operating Segments | Protein-based products      
Segment Reporting Information      
Net Sales 29.3 13.6  
Operating Segments | Other      
Segment Reporting Information      
Net Sales 122.1 14.1  
Operating Segments | Post Consumer Brands      
Segment Reporting Information      
Net Sales 1,103.8 963.9  
Cost of goods sold 775.9 635.2  
Selling, general and administrative expenses 170.9 175.2  
Segment Reporting, Other Segment Item, Amount 24.8 22.5  
Segment Profit (Loss) 132.2 131.0  
Additions to property and intangibles 70.8 79.5  
Depreciation and amortization 67.1 58.2  
Assets 5,690.6   6,290.2
Operating Segments | Foodservice      
Segment Reporting Information      
Net Sales 669.1 616.6  
Cost of goods sold 496.2 479.4  
Selling, general and administrative expenses 42.2 38.4  
Segment Reporting, Other Segment Item, Amount 13.2 12.7  
Segment Profit (Loss) 117.5 86.1  
Depreciation and amortization 35.8 31.7  
Operating Segments | Refrigerated Retail      
Segment Reporting Information      
Net Sales 266.6 266.6  
Cost of goods sold 181.7 187.7  
Selling, general and administrative expenses 43.7 44.4  
Segment Reporting, Other Segment Item, Amount 10.8 10.3  
Segment Profit (Loss) 30.4 24.2  
Depreciation and amortization 19.3 17.4  
Operating Segments | Weetabix      
Segment Reporting Information      
Net Sales 137.9 127.6  
Cost of goods sold 83.3 80.8  
Selling, general and administrative expenses 31.9 30.4  
Segment Reporting, Other Segment Item, Amount 1.0 0.5  
Segment Profit (Loss) 21.7 15.9  
Additions to property and intangibles 4.4 8.4  
Depreciation and amortization 11.3 12.0  
Assets 1,926.2   1,924.9
Operating Segments | Foodservice and Refrigerated Retail      
Segment Reporting Information      
Additions to property and intangibles 39.9 51.1  
Assets 4,996.2   5,028.1
Corporate and eliminations      
Segment Reporting Information      
Net Sales (2.8) 0.0  
Corporate      
Segment Reporting Information      
General corporate expenses and other 58.8 37.3  
Additions to property and intangibles 1.3 0.0  
Depreciation and amortization 19.0 $ 1.0  
Assets $ 371.3   $ 285.2