Schedule of Goodwill Carrying Value Rollfoward (Details 4) - USD ($) $ in Thousands		9 Months Ended
		Dec. 31, 2016	Mar. 31, 2016
Goodwill Gross Value [Member]
Goodwill
Goodwill, Gross		$ 3,089,352	$ 2,641,416
Impact of excess tax basis amortization		(15,622)
Goodwill, Acquired During Period	[1]	498,778
Other, including changes in foreign exchange rates		(35,220)
Goodwill Accumulated Impairment [Member]
Goodwill
Goodwill, Impaired, Accumulated Impairment Loss		(1,161,900)	(1,161,900)
Impact of excess tax basis amortization		0
Goodwill, Acquired During Period		0
Other, including changes in foreign exchange rates		0
Goodwill Net Value [Member]
Goodwill
Goodwill		1,927,452	$ 1,479,516
Impact of excess tax basis amortization		(15,622)
Goodwill, Acquired During Period	[1]	498,778
Other, including changes in foreign exchange rates		$ (35,220)

[1] See Note 3 for additional information.