v3.26.1
Derivative Financial Instruments - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Nov. 15, 2023
Apr. 28, 2023
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2020
Derivative Financial Instruments (Textual) [Abstract]            
Collateral received       $ 37.5    
Collateral pledged     $ (7.4)      
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses)     22.2 80.8    
Settlement of interest rate contracts     0.0 0.0 $ 42.5  
Interest expense – net     (381.2) (388.7) (264.3)  
Loss (Gain) on Reverse Tresaury Lock       4.5    
Other debt gains (charges) – net [1]     $ 0.0 30.2 [2] (19.5)  
Post Holdings Inc. | Pet Food Brands            
Derivative Financial Instruments (Textual) [Abstract]            
Proceeds from Divestiture of Business, Equity 5.4 5.4        
Proceeds from investment in equity securities $ 466.3          
Commodity contracts            
Derivative Financial Instruments (Textual) [Abstract]            
Derivative instrument maturity     1 year      
Foreign currency exchange contracts            
Derivative Financial Instruments (Textual) [Abstract]            
Derivative instrument maturity     1 year      
Forward Contracts | Post Holdings Inc. | Pet Food Brands            
Derivative Financial Instruments (Textual) [Abstract]            
Gain (loss) on derivative - net         5.4  
Interest rate contract            
Derivative Financial Instruments (Textual) [Abstract]            
Settlement of interest rate contracts         $ 42.5  
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss           $ (239.8)
Deferred Gain (Loss) on Cash Flow Hedges Included in Accumulated Other Comprehensive Income or Loss     $ (104.9) (117.4)    
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss     24.4 $ 27.3    
Effective portion of the hedge loss reclassified to interest expense over the next twelve months     $ (12.5)      
[1] Includes special project costs related to certain divestiture, acquisition, integration, and restructuring activities. For more information, see Note 4: Special Project Costs, Note 5: Reportable Segments, and Note 8: Debt and Financing Arrangements.
[2] Includes special project costs related to certain divestiture, acquisition, integration, and restructuring activities. For more information, see Note 4: Special Project Costs and Note 8: Debt and Financing Arrangements.