Schedule of Goodwill Carrying Value Rollfoward (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Goodwill Gross Value [Member]
Goodwill
Goodwill, Gross	$ 2,402,423	$ 2,431,065	$ 2,436,945
Goodwill, Subsequent Recognition of Deferred Tax Asset	(21,675)	(21,573)
Goodwill, Acquired During Period		28,983
Goodwill, Other Changes, Including Foreign Exchange Rates	(6,967)	(13,290)
Goodwill Accumulated Impairment [Member]
Goodwill
Goodwill, Impaired, Accumulated Impairment Loss	(1,161,900)	(1,161,900)	(1,161,900)
Goodwill, Subsequent Recognition of Deferred Tax Asset	0	0
Goodwill, Acquired During Period		0
Goodwill, Other Changes, Including Foreign Exchange Rates	0	0
Goodwill Net Value [Member]
Goodwill
Goodwill	1,240,523	1,269,165	1,275,045
Goodwill, Subsequent Recognition of Deferred Tax Asset	(21,675)	(21,573)
Goodwill, Acquired During Period		28,983
Goodwill, Other Changes, Including Foreign Exchange Rates	$ (6,967)	$ (13,290)