Goodwill And Other Intangible Assets (Changes In Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill at period start date	$ 1,163,803
Acquisitions	36,814	[1]
Other adjustments, including foreign currency translation	(1,919)
Goodwill at period end date	1,198,698
Distribution Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	969,394
Acquisitions	34,305	[1]
Other adjustments, including foreign currency translation	(1,928)
Goodwill at period end date	1,001,771
All Other Operations Business Segment [Member]
Goodwill [Roll Forward]
Goodwill at period start date	194,409
Acquisitions	2,509	[1]
Other adjustments, including foreign currency translation	9
Goodwill at period end date	$ 196,927

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