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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
6 Months Ended
Mar. 31, 2016
USD ($)
claimants
Mar. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
claimants
Respirator Liabilities [Member]      
Loss Contingencies [Line Items]      
Number of claimants | claimants 37,000   38,000
Respirator reserve $ 9   $ 11
Cash payments for respirator reserves 2 $ 2  
Environmental Matters [Member]      
Loss Contingencies [Line Items]      
Reserved for environmental matters 14   $ 16
Cash payments for environmental reserves $ 1    
Maximum [Member] | Environmental Matters [Member]      
Loss Contingencies [Line Items]      
Cash payments for environmental reserves   $ 1