Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Income Statement [Abstract]
Sales	$ 1,166	$ 1,055	$ 2,095	$ 1,911
Excise taxes	252	225	458	420
Net sales	914	830	1,637	1,491
Cost of sales	304	278	534	486
Gross profit	610	552	1,103	1,005
Advertising expenses	111	107	200	190
Selling, general, and administrative expenses	163	163	324	326
Other expense (income), net	(10)	(9)	(11)	(15)
Operating income	346	291	590	504
Interest income	1	1	2	1
Interest expense	16	16	32	28
Income before income taxes	331	276	560	477
Income taxes	92	79	143	135
Net income	$ 239	$ 197	$ 417	$ 342
Earnings per share:
Basic (dollars per share)	$ 0.62	$ 0.51	$ 1.08	$ 0.87
Diluted (dollars per share)	0.62	0.50	1.08	0.87
Cash dividends per common share:
Declared (dollars per share)	0	0	0.365	0.34
Paid (dollars per share)	$ 0.1825	$ 0.17	$ 0.365	$ 0.34