Goodwill (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Balance at March 31, 2020	$ 3,795,325
Acquisitions	347,467
Dispositions	(24,073)
Effects of foreign currency	7,762
Balance at September 30, 2020	4,126,481
Software and Analytics [Member]
Goodwill [Line Items]
Balance at March 31, 2020	1,770,118
Acquisitions	23,191
Dispositions	(24,073)
Effects of foreign currency	7,762
Balance at September 30, 2020	1,776,998
Network Solutions [Member]
Goodwill [Line Items]
Balance at March 31, 2020	1,645,831
Acquisitions	324,143
Balance at September 30, 2020	1,969,974
Technology-Enabled Services [Member]
Goodwill [Line Items]
Balance at March 31, 2020	379,376
Acquisitions	133
Balance at September 30, 2020	$ 379,509

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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