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Contingencies, Significant Estimates and Concentrations - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Loss Contingencies [Line Items]          
Approximate percentage of workforce covered under collective bargaining agreements (as a percent) 23.00% 23.00%      
Miscellaneous, net [1]   $ 2,200,000 $ 1,300,000 $ (5,800,000)  
Defense          
Loss Contingencies [Line Items]          
Litigation compensation recommendation         $ 25.3
Former Gain Contingency, Recognized in Current Period $ 4,200,000 4,200,000   19,000,000.0  
Commercial          
Loss Contingencies [Line Items]          
Former Gain Contingency, Recognized in Current Period 1,500,000 1,500,000      
Gain on Business Interruption Insurance Recovery 18,500,000 18,500,000   $ 6,600,000  
Reduction of cost of sales   10,800,000      
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 33,800,000 33,800,000 36,200,000    
Performance and Specialty Bonds          
Loss Contingencies [Line Items]          
Commitments and contingencies 721,100,000 721,100,000 552,200,000    
Standby Letters of Credit          
Loss Contingencies [Line Items]          
Commitments and contingencies $ 64,400,000 $ 64,400,000 $ 63,700,000    
[1] Fiscal 2020 results include a $6.2 million gain from insurance proceeds in excess of property loss in the Commercial segment.