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Acquisitions and Divestitures - Narrative (Details)
$ in Millions
3 Months Ended
Dec. 31, 2019
USD ($)
service_center_store
Dec. 31, 2018
USD ($)
service_center_store
Business Acquisition [Line Items]    
Number of service center stores acquired | service_center_store 9 35
Consideration for acquisition | $ $ 6 $ 30
Finite-Lived Intangible Assets [Line Items]    
Gain on sale | $ $ 0  
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Disposition, Number of Service Centers Sold | service_center_store 6