Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Income Statement [Abstract]
Net sales	$ 1,026.9	$ 959.0	$ 2,918.8	$ 2,813.1
Excise taxes	280.0	257.4	729.4	692.5
Cost of sales	240.2	250.7	694.1	747.4
Gross profit	506.7	450.9	1,495.3	1,373.2
Advertising expenses	110.5	98.8	309.1	296.3
Selling, general, and administrative expenses	162.4	148.0	469.9	433.9
Amortization expense	0	0.8	0	3.4
Other (income) expense, net	(3.2)	(2.9)	(4.8)	1.3
Operating income	237.0	206.2	721.1	638.3
Interest income	0.7	0.6	1.9	2.1
Interest expense	8.3	7.9	19.0	23.6
Income before income taxes	229.4	198.9	704.0	616.8
Income taxes	71.8	65.8	226.0	208.1
Net income	$ 157.6	$ 133.1	$ 478.0	$ 408.7
Earnings per share:
Basic	$ 0.74	$ 0.63	$ 2.24	$ 1.90
Diluted	$ 0.73	$ 0.62	$ 2.22	$ 1.89
Cash dividends per common share:
Declared	$ 4.510	$ 0.467	$ 4.977	$ 0.893
Paid	$ 4.255	$ 0.233	$ 4.722	$ 0.660