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Divestitures - Narrative (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff - USD ($)
6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
USPS Separation, IT Services Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue $ 39,000,000    
USPS Separation, Separation and Distribution Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amount of cash consideration received   $ 984,000,000  
Transaction consideration   1,050,000,000  
Debt assumed   66,000,000  
USPS Separation      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue   $ 431,000,000  
Gain (loss) on disposition     $ 0