Consolidated Condensed Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	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	331,179		331,179
Comprehensive loss, net of tax	(61,154)			(61,154)
Dividends	(98,826)		(98,826)
Stock-based compensation	36,496	$ 36,496
Vesting of stock-based compensation awards (in shares)		493,000
Stock options exercised (in shares)		564,000
Stock options exercised	72,896	$ 72,896
Repurchase of common stock (in shares)					(1,788,000)
Repurchase of common stock	(659,235)				$ (659,235)
Ending balance (in shares) at Aug. 31, 2021		190,128,000
Ending balance at Aug. 31, 2021	$ 3,309,203	$ 1,625,594	8,109,368	(30,266)	$ (6,395,493)
Ending balance (in shares) at Aug. 31, 2021					(86,798,000)
Beginning balance (in shares) at May. 31, 2022	190,837,921	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, 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	191,654,188	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)