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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Loss Contingencies [Line Items]      
Raw material purchased $ 262,000,000 $ 280,000,000 $ 370,000,000
Accounts payable and accrued liabilities 8,000,000 12,000,000  
Reserved for environmental matters 5,000,000 5,000,000  
Charges for environmental expense $ 1,000,000 $ 1,000,000 $ 1,000,000
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of sales Cost of sales Cost of sales
Cash payments for environmental reserves $ 1,000,000 $ 1,000,000 $ 1,000,000
Settlement amount 2,000,000 3,000,000 9,000,000
Indirect tax settlement charges 7,000,000    
(Provision) benefit for income taxes (196,000,000) (111,000,000) 28,000,000
Respirator Liabilities [Member]      
Loss Contingencies [Line Items]      
Respirator reserve and defense costs 33,000,000 35,000,000  
Respirator Liabilities [Member] | Selling and Administrative Expenses [Member]      
Loss Contingencies [Line Items]      
Respirator charge 0 0 8,000,000
Per Accident for Auto [Member]      
Loss Contingencies [Line Items]      
Self-insured liability 500,000    
Per Occurrence for All Other [Member]      
Loss Contingencies [Line Items]      
Self-insured liability 2,000,000    
Per Accident for U.S. Workers' Compensation [Member]      
Loss Contingencies [Line Items]      
Self-insured liability 1,000,000    
Maximum [Member]      
Loss Contingencies [Line Items]      
Retention for medical costs per person per annum 300,000    
Non-Controlling Interests [Member]      
Loss Contingencies [Line Items]      
Raw material purchased $ 124,000,000 $ 138,000,000 $ 192,000,000