Schedule of Goodwill Carrying Value Rollfoward (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	4.00%
Goodwill Gross Value [Member]
Goodwill
Goodwill, Gross, Beginning of Period	$ 3,094,255	$ 3,086,789
Goodwill, Acquired During Period		1,460
Impact of excess tax basis amortization	(10,972)	(13,726)
Other, including changes in foreign exchange rates	(37,829)	19,732
Goodwill, Gross, End of Period	3,045,454	3,094,255
Goodwill Accumulated Impairment [Member]
Goodwill
Accumulated Impairment, Beginning of Period	(1,161,900)	(1,161,900)
Accumulated Impairment, End of Period	(1,161,900)	(1,161,900)
Goodwill Net Value [Member]
Goodwill
Goodwill, Beginning of Period	1,932,355	1,924,889
Goodwill, Acquired During Period		1,460
Impact of excess tax basis amortization	(10,972)	(13,726)
Other, including changes in foreign exchange rates	(37,829)	19,732
Goodwill, End of Period	$ 1,883,554	$ 1,932,355