Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Paid-In Capital	Retained Earnings	Other Accumulated Comprehensive Income	Treasury Stock
Beginning balance (in shares) at May. 31, 2021		189,071,000
Beginning balance at May. 31, 2021	$ 3,687,847	$ 1,516,202	$ 7,877,015	$ 30,888	$ (5,736,258)
Beginning balance (in shares) at May. 31, 2021					(85,010,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,235,757		1,235,757
Comprehensive income (loss), net of tax	77,029			77,029
Dividends	(393,609)		(393,609)
Stock-based compensation	109,308	$ 109,308
Vesting of stock-based compensation awards (in shares)		528,000
Stock options exercised (in shares)		1,239,000			(71,000)
Stock options exercised	117,737	$ 146,407			$ (28,670)
Repurchase of common stock (in shares)					(4,046,000)
Repurchase of common stock	(1,525,873)				$ (1,525,873)
Ending balance (in shares) at May. 31, 2022		190,838,000
Ending balance at May. 31, 2022	3,308,196	$ 1,771,917	8,719,163	107,917	$ (7,290,801)
Ending balance (in shares) at May. 31, 2022					(89,127,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,348,010		1,348,010
Comprehensive income (loss), net of tax	(30,139)			(30,139)
Dividends	(469,858)		(469,858)
Stock-based compensation	103,621	$ 103,621
Vesting of stock-based compensation awards (in shares)		287,000
Stock options exercised (in shares)		1,074,000			(360,000)
Stock options exercised	3,021	$ 156,004			$ (152,983)
Repurchase of common stock (in shares)					(980,000)
Repurchase of common stock	$ (398,865)				$ (398,865)
Ending balance (in shares) at May. 31, 2023	192,198,938	192,199,000
Ending balance at May. 31, 2023	$ 3,863,986	$ 2,031,542	9,597,315	77,778	$ (7,842,649)
Ending balance (in shares) at May. 31, 2023	(90,466,790)				(90,467,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,571,592		1,571,592
Comprehensive income (loss), net of tax	13,423			13,423
Dividends	(550,952)		(550,952)
Stock-based compensation	116,986	$ 116,986
Vesting of stock-based compensation awards (in shares)		162,000
Stock options exercised (in shares)		913,000			(283,000)
Stock options exercised	1,370	$ 156,773			$ (155,403)
Repurchase of common stock (in shares)					(1,272,000)
Repurchase of common stock	$ (700,033)				$ (700,033)
Ending balance (in shares) at May. 31, 2024	193,274,296	193,274,000
Ending balance at May. 31, 2024	$ 4,316,372	$ 2,305,301	$ 10,617,955	$ 91,201	$ (8,698,085)
Ending balance (in shares) at May. 31, 2024	(92,022,302)				(92,022,000)