Stock-Based Compensation - Stock Options Granted and Outstanding (Details) - $ / shares	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020	May 31, 2019
Shares
Outstanding, beginning of period (in shares)	6,055,524	7,105,399	8,208,934
Granted (in shares)	531,963	747,550	575,813
Canceled (in shares)	(877)	(1,452)	(5,432)
Forfeited (in shares)	(260,249)	(91,722)	(312,391)
Exercised (in shares)	(1,238,959)	(1,704,251)	(1,361,525)
Outstanding, end of period (in shares)	5,087,402	6,055,524	7,105,399
Options exercisable (in shares)	1,575,999	1,548,867	1,913,374	1,919,976
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 191.11	$ 145.54	$ 123.80
Granted (in dollars per share)	398.92	348.24	250.50
Canceled (in dollars per share)	116.25	59.51	72.17
Forfeited (in dollars per share)	273.53	193.94	185.08
Exercised (in dollars per share)	118.21	83.31	70.03
Outstanding, end of period (in dollars per share)	$ 230.62	$ 191.11	$ 145.54