Common Stock and Stock-Based Compensation - Stock Option Transactions Under Plan (Detail) - Stock Incentive Plan shares in Millions	12 Months Ended
	May 31, 2021 $ / shares shares
Options Outstanding - Shares
Beginning Balance (in shares) | shares	88.1
Exercised (in shares) | shares	(20.7)
Forfeited (in shares) | shares	(3.8)
Granted (in shares) | shares	14.7
Ending Balance (in shares) | shares	78.3
Options exercisable (in shares) | shares	44.2
Options Outstanding - Weighted-Average Option Price
Beginning Balance (in dollars per share) | $ / shares	$ 60.98
Exercised (in dollars per share) | $ / shares	46.31
Forfeited (in dollars per share) | $ / shares	95.87
Granted (in dollars per share) | $ / shares	112.65
Ending Balance (in dollars per share) | $ / shares	72.88
Options exercisable (in dollars per share) | $ / shares	$ 57.43