Goodwill (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
Sep. 30, 2021 USD ($)
Goodwill [Line Items]
Balance at March 31, 2021	$ 4,108,792
Effects of foreign currency	2,173
Adjustments	(142)
Balance at June 30, 2021	4,110,823
Software and Analytics [Member]
Goodwill [Line Items]
Balance at March 31, 2021	1,758,302
Effects of foreign currency	2,173
Adjustments	(142)
Balance at June 30, 2021	1,760,333
Network Solutions [Member]
Goodwill [Line Items]
Balance at March 31, 2021	1,970,739
Balance at June 30, 2021	1,970,739
Technology-Enabled Services [Member]
Goodwill [Line Items]
Balance at March 31, 2021	379,752
Balance at June 30, 2021	$ 379,752

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Publisher FASB
-Name Accounting Standards Codification
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