Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 959.0	$ 962.4	$ 2,813.1	$ 2,613.0
Excise taxes	257.4	254.4	692.5	637.2
Cost of sales	250.7	244.5	747.4	674.7
Gross profit	450.9	463.5	1,373.2	1,301.1
Advertising expenses	98.8	96.8	296.3	266.7
Selling, general, and administrative expenses	148.0	142.3	433.9	407.2
Amortization expense	0.8	1.3	3.4	3.8
Other (income) expense, net	(2.9)	(2.4)	1.3	(9.7)
Operating income	206.2	225.5	638.3	633.1
Interest income	0.6	0.6	2.1	1.7
Interest expense	7.9	7.5	23.6	20.9
Income before income taxes	198.9	218.6	616.8	613.9
Income taxes	65.8	77.9	208.1	207.8
Net income	$ 133.1	$ 140.7	$ 408.7	$ 406.1
Earnings per share:
Basic	$ 0.94	$ 0.97	$ 2.85	$ 2.78
Diluted	$ 0.93	$ 0.96	$ 2.83	$ 2.77
Cash dividends per common share:
Declared	$ 0.70	$ 1.64	$ 1.34	$ 2.24
Paid	$ 0.35	$ 1.32	$ 0.99	$ 1.92