Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 840.3	$ 744.9
Excise taxes	202.5	175.5
Cost of sales	217.5	190.6
Gross profit	420.3	378.8
Advertising expenses	90.8	76.3
Selling, general, and administrative expenses	139.0	131.9
Amortization expense	1.3	1.3
Other (income) expense, net	3.3	(3.4)
Operating income	185.9	172.7
Interest income	0.8	0.5
Interest expense	7.9	6.7
Income before income taxes	178.8	166.5
Income taxes	60.7	55.1
Net income	$ 118.1	$ 111.4
Earnings per share:
Basic	$ 0.81	$ 0.76
Diluted	$ 0.81	$ 0.76
Cash dividends per common share:
Declared	$ 0.64	$ 0.60
Paid	$ 0.32	$ 0.30