Supplemental Cash Flow Information (Noncash Investing and Financing Activities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Noncash or Part Noncash Acquisitions [Line Items]
Net cash paid for acquisitions	$ (23,463)		$ (5,143)
FY15 Acquisitions [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Fair value of assets acquired	35,761
Net cash paid for acquisitions	(23,463)	[1]
Stock issued for acquisition	(4,458)	[2]
Liabilities assumed	$ 7,840

[1] Includes cash paid, net of cash acquired, for current year acquisitions as well as payments for the settlement of holdback liabilities and contingent consideration arrangements associated with prior year acquisitions.

[2] Represents shares of Airgas, Inc. common stock issued in connection with a single acquisition – see Note 3 for further information.