Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 88,852	$ 84,686
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	72,635	67,030
Amortization	7,752	7,229
Deferred income taxes	(4,554)	3,995
Gain on sales of plant and equipment	(959)	(334)
Stock-based compensation expense	14,830	13,728
Changes in assets and liabilities, excluding effects of business acquisitions:
Trade receivables, net	(9,104)	(10,032)
Inventories, net	347	(11,006)
Prepaid expenses and other current assets	1,163	15,745
Accounts payable, trade	(7,473)	(14,048)
Accrued expenses and other current liabilities	31,567	16,925
Other, net	1,916	(3,219)
Net cash provided by operating activities	196,972	170,699
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(108,580)	(81,998)
Proceeds from sales of plant and equipment	5,452	3,998
Business acquisitions and holdback settlements	(23,463)	(5,143)
Other, net	(1,113)	(1,007)
Net cash used in investing activities	(127,704)	(84,150)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in short-term debt	(335,015)	49,000
Proceeds from borrowings of long-term debt	300,528	3,522
Repayment of long-term debt	(553)	(119,561)
Financing costs	(2,133)	0
Purchase of treasury stock	0	(8,127)
Proceeds from the exercise of stock options	11,578	11,053
Stock issued for the Employee Stock Purchase Plan	4,602	4,398
Excess tax benefit realized from the exercise of stock options	4,063	2,672
Dividends paid to stockholders	(40,914)	(35,202)
Change in cash overdraft and other	(3,673)	(9,714)
Net cash used in financing activities	(61,517)	(101,959)
Change in cash	7,751	(15,410)
Cash - Beginning of period	69,561	86,386
Cash - End of period	$ 77,312	$ 70,976