Goodwill And Other Intangible Assets (Changes In Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014
Goodwill [Roll Forward]
Balance at March 31, 2014	$ 1,289,896
Acquisitions	19,943	[1]
Other adjustments, including foreign currency translation	(592)
Balance at September 30, 2014	1,309,247
Distribution Business Segment [Member]
Goodwill [Roll Forward]
Balance at March 31, 2014	1,092,728
Acquisitions	19,943	[1]
Other adjustments, including foreign currency translation	(576)
Balance at September 30, 2014	1,112,095
All Other Operations Business Segment [Member]
Goodwill [Roll Forward]
Balance at March 31, 2014	197,168
Acquisitions	0	[1]
Other adjustments, including foreign currency translation	(16)
Balance at September 30, 2014	$ 197,152

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