Goodwill And Other Intangible Assets (Changes In Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Goodwill [Roll Forward]
Goodwill at period start date	$ 1,195,613		$ 1,163,803
Acquisitions	95,410	[1]	34,205	[1]
Other adjustments, including foreign currency translation	(1,127)		(2,395)
Goodwill at period end date	1,289,896		1,195,613
Distribution Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	998,128		969,394
Acquisitions	95,626	[1]	31,104	[1]
Other adjustments, including foreign currency translation	(1,026)		(2,370)
Goodwill at period end date	1,092,728		998,128
All Other Operations Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	197,485		194,409
Acquisitions	(216)	[1]	3,101	[1]
Other adjustments, including foreign currency translation	(101)		(25)
Goodwill at period end date	$ 197,168		$ 197,485

[1] Includes acquisitions completed during the respective year and adjustments made to prior year acquisitions.