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Contingencies, Significant Estimates and Concentrations - Additional Information (Details) - USD ($)
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Loss Contingencies [Line Items]      
Approximate percentage of workforce covered under collective bargaining agreements (as a percent) 19.00%    
Miscellaneous, net [1] $ (2,100,000) $ 2,200,000 $ 1,300,000
Commercial      
Loss Contingencies [Line Items]      
Gain on Business Interruption Insurance Recovery   18,500,000  
Reduction of cost of sales   10,800,000  
Former Gain Contingency, Recognized in Current Period   1,500,000  
Miscellaneous, net   6,200,000  
Personal Injury Actions and Other      
Loss Contingencies [Line Items]      
Maximum self-insurance available per claim 5,000,000.0    
Reserve for loss contingencies 49,500,000 33,800,000  
Performance and Specialty Bonds      
Loss Contingencies [Line Items]      
Commitments and contingencies 1,130,000,000 721,100,000  
Standby Letters of Credit      
Loss Contingencies [Line Items]      
Commitments and contingencies $ 22,300,000 $ 64,400,000  
[1] Fiscal 2020 results include a $6.2 million gain from insurance proceeds in excess of property loss in the Commercial segment.