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Business Acquisitions and Divestitures Fiscal 2017 Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Business Acquisition [Line Items]          
Revenues $ 756,132 $ 736,840 $ 1,425,064 $ 1,433,643  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]          
Goodwill $ 2,417,956   $ 2,417,956   $ 2,356,085