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Segment Information - Narrative (Details) - reportablesegment
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Revenue, Major Customer [Line Items]        
Reportable segments (in segments)     4  
Non-US | Sales Revenue | Geographic Concentration Risk        
Revenue, Major Customer [Line Items]        
Concentration risk (as a percentage) 10.90% 14.60% 13.10% 15.40%