CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock and Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning balance (in shares) at May. 31, 2022		190,838,000
Beginning balance at May. 31, 2022	$ 3,308,196	$ 1,771,917	$ 8,719,163	$ 107,917	$ (7,290,801)
Beginning balance (in shares) at May. 31, 2022					(89,127,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	351,689		351,689
Comprehensive (loss) income, net of tax	(19,793)			(19,793)
Dividends	(117,461)		(117,461)
Stock-based compensation	26,282	$ 26,282
Vesting of stock-based compensation awards (in shares)		273,000
Stock options exercised (in shares)		543,000			(193,000)
Stock options exercised	1,047	$ 80,638			$ (79,591)
Repurchase of common stock (in shares)					(802,000)
Repurchase of common stock	(320,334)				$ (320,334)
Ending balance (in shares) at Aug. 31, 2022		191,654,000
Ending balance at Aug. 31, 2022	3,229,626	$ 1,878,837	8,953,391	88,124	$ (7,690,726)
Ending balance (in shares) at Aug. 31, 2022					(90,122,000)
Beginning balance (in shares) at May. 31, 2022		190,838,000
Beginning balance at May. 31, 2022	3,308,196	$ 1,771,917	8,719,163	107,917	$ (7,290,801)
Beginning balance (in shares) at May. 31, 2022					(89,127,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,001,809
Comprehensive (loss) income, net of tax	(31,813)
Repurchase of common stock	(370,917)
Ending balance (in shares) at Feb. 28, 2023		192,032,000
Ending balance at Feb. 28, 2023	3,633,256	$ 1,981,610	9,368,678	76,104	$ (7,793,136)
Ending balance (in shares) at Feb. 28, 2023					(90,359,000)
Beginning balance (in shares) at Aug. 31, 2022		191,654,000
Beginning balance at Aug. 31, 2022	3,229,626	$ 1,878,837	8,953,391	88,124	$ (7,690,726)
Beginning balance (in shares) at Aug. 31, 2022					(90,122,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	324,293		324,293
Comprehensive (loss) income, net of tax	(4,028)			(4,028)
Dividends	(117,338)		(117,338)
Stock-based compensation	25,255	$ 25,255
Vesting of stock-based compensation awards (in shares)		9,000
Stock options exercised (in shares)		194,000			(66,000)
Stock options exercised	1,078	$ 29,053			$ (27,975)
Repurchase of common stock (in shares)					(68,000)
Repurchase of common stock	(28,348)				$ (28,348)
Ending balance (in shares) at Nov. 30, 2022		191,857,000
Ending balance at Nov. 30, 2022	3,430,538	$ 1,933,145	9,160,346	84,096	$ (7,747,049)
Ending balance (in shares) at Nov. 30, 2022					(90,256,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	325,827		325,827
Comprehensive (loss) income, net of tax	(7,992)			(7,992)
Dividends	(117,495)		(117,495)
Stock-based compensation	23,797	$ 23,797
Vesting of stock-based compensation awards (in shares)		3,000
Stock options exercised (in shares)		172,000			(54,000)
Stock options exercised	816	$ 24,668			$ (23,852)
Repurchase of common stock (in shares)					(49,000)
Repurchase of common stock	(22,235)				$ (22,235)
Ending balance (in shares) at Feb. 28, 2023		192,032,000
Ending balance at Feb. 28, 2023	$ 3,633,256	$ 1,981,610	9,368,678	76,104	$ (7,793,136)
Ending balance (in shares) at Feb. 28, 2023					(90,359,000)
Beginning balance (in shares) at May. 31, 2023	192,198,938	192,199,000
Beginning balance at May. 31, 2023	$ 3,863,986	$ 2,031,542	9,597,315	77,778	$ (7,842,649)
Beginning balance (in shares) at May. 31, 2023	(90,466,790)				(90,467,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 385,085		385,085
Comprehensive (loss) income, net of tax	9,391			9,391
Dividends	(138,272)		(138,272)
Stock-based compensation	30,242	$ 30,242
Vesting of stock-based compensation awards (in shares)		156,000
Stock options exercised (in shares)		303,000			(118,000)
Stock options exercised	479	$ 59,691			$ (59,212)
Repurchase of common stock (in shares)					(145,000)
Repurchase of common stock	(73,276)				$ (73,276)
Ending balance (in shares) at Aug. 31, 2023		192,658,000
Ending balance at Aug. 31, 2023	$ 4,077,635	$ 2,121,475	9,844,128	87,169	$ (7,975,137)
Ending balance (in shares) at Aug. 31, 2023					(90,730,000)
Beginning balance (in shares) at May. 31, 2023	192,198,938	192,199,000
Beginning balance at May. 31, 2023	$ 3,863,986	$ 2,031,542	9,597,315	77,778	$ (7,842,649)
Beginning balance (in shares) at May. 31, 2023	(90,466,790)				(90,467,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,157,277
Comprehensive (loss) income, net of tax	8,545
Repurchase of common stock	$ (468,146)
Ending balance (in shares) at Feb. 29, 2024	193,090,252	193,090,000
Ending balance at Feb. 29, 2024	$ 4,234,083	$ 2,246,329	10,341,248	86,323	$ (8,439,817)
Ending balance (in shares) at Feb. 29, 2024	(91,646,162)				(91,646,000)
Beginning balance (in shares) at Aug. 31, 2023		192,658,000
Beginning balance at Aug. 31, 2023	$ 4,077,635	$ 2,121,475	9,844,128	87,169	$ (7,975,137)
Beginning balance (in shares) at Aug. 31, 2023					(90,730,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	374,613		374,613
Comprehensive (loss) income, net of tax	6,170			6,170
Dividends	(137,474)		(137,474)
Stock-based compensation	22,940	$ 22,940
Vesting of stock-based compensation awards (in shares)		3,000
Stock options exercised (in shares)		200,000			(68,000)
Stock options exercised	449	$ 35,536			$ (35,087)
Repurchase of common stock (in shares)					(716,000)
Repurchase of common stock	(349,852)				$ (349,852)
Ending balance (in shares) at Nov. 30, 2023		192,861,000
Ending balance at Nov. 30, 2023	3,994,481	$ 2,179,951	10,081,267	93,339	$ (8,360,076)
Ending balance (in shares) at Nov. 30, 2023					(91,514,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	397,579		397,579
Comprehensive (loss) income, net of tax	(7,016)			(7,016)
Dividends	(137,598)		(137,598)
Stock-based compensation	31,308	$ 31,308
Vesting of stock-based compensation awards (in shares)		1,000
Stock options exercised (in shares)		228,000			(58,000)
Stock options exercised	347	$ 35,070			$ (34,723)
Repurchase of common stock (in shares)					(74,000)
Repurchase of common stock	$ (45,018)				$ (45,018)
Ending balance (in shares) at Feb. 29, 2024	193,090,252	193,090,000
Ending balance at Feb. 29, 2024	$ 4,234,083	$ 2,246,329	$ 10,341,248	$ 86,323	$ (8,439,817)
Ending balance (in shares) at Feb. 29, 2024	(91,646,162)				(91,646,000)