Goodwill And Other Intangible Assets (Changes In Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill at period start date	$ 1,195,613
Acquisitions	82,153	[1]
Other adjustments, including foreign currency translation	(500)
Goodwill at period end date	1,277,266
Distribution Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	998,128
Acquisitions	82,369	[1]
Other adjustments, including foreign currency translation	(446)
Goodwill at period end date	1,080,051
All Other Operations Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	197,485
Acquisitions	(216)	[1]
Other adjustments, including foreign currency translation	(54)
Goodwill at period end date	$ 197,215

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