Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
BALANCE, SHARES at Feb. 29, 2020		163,081,000
BALANCE at Feb. 29, 2020	$ 3,768,875	$ 81,541	$ 1,348,988	$ 2,488,417	$ (150,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect | Accounting Standards Update 2016-13 [Member]	(153,306)			(153,306)
Net earnings	4,978			4,978
Other Comprehensive Income (Loss), Net of Tax	(15,334)				(15,334)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	17,652		17,652
Stock Repurchased and Retired During Period, Shares		(515,000)
Stock Repurchased and Retired During Period, Value	(40,709)	$ (258)	(4,271)	(36,180)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		35,000
Stock Issued During Period, Value, Stock Options Exercised	1,706	$ 18	1,688
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		154,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(5,552)	$ 77	(5,629)
BALANCE, SHARES at May. 31, 2020		162,755,000
BALANCE at May. 31, 2020	3,578,310	$ 81,378	1,358,428	2,303,909	(165,405)
BALANCE, SHARES at Feb. 29, 2020		163,081,000
BALANCE at Feb. 29, 2020	3,768,875	$ 81,541	1,348,988	2,488,417	(150,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	536,974
Other Comprehensive Income (Loss), Net of Tax	(2,853)
BALANCE, SHARES at Nov. 30, 2020		163,034,000
BALANCE at Nov. 30, 2020	4,128,476	$ 81,517	1,462,130	2,737,753	(152,924)
BALANCE, SHARES at May. 31, 2020		162,755,000
BALANCE at May. 31, 2020	3,578,310	$ 81,378	1,358,428	2,303,909	(165,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	296,696			296,696
Other Comprehensive Income (Loss), Net of Tax	4,979				4,979
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	12,568		12,568
Stock Repurchased and Retired During Period, Shares		0
Stock Repurchased and Retired During Period, Value	0	$ 0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		1,403,000
Stock Issued During Period, Value, Stock Options Exercised	90,019	$ 701	89,318
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		4,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(12)	$ 2	(14)
BALANCE, SHARES at Aug. 31, 2020		164,162,000
BALANCE at Aug. 31, 2020	3,982,560	$ 82,081	1,460,300	2,600,605	(160,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	235,300			235,300
Other Comprehensive Income (Loss), Net of Tax	7,502				7,502
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	9,942		9,942
Stock Repurchased and Retired During Period, Shares		(1,176,000)
Stock Repurchased and Retired During Period, Value	(109,249)	$ (588)	(10,509)	(98,152)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		43,000
Stock Issued During Period, Value, Stock Options Exercised	2,570	$ 21	2,549
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		5,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(149)	$ 3	(152)
BALANCE, SHARES at Nov. 30, 2020		163,034,000
BALANCE at Nov. 30, 2020	$ 4,128,476	$ 81,517	1,462,130	2,737,753	(152,924)
BALANCE, SHARES at Feb. 28, 2021	163,172,333	163,172,000
BALANCE at Feb. 28, 2021	$ 4,364,613	$ 81,586	1,513,821	2,887,897	(118,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	436,756			436,756
Other Comprehensive Income (Loss), Net of Tax	2,937				2,937
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	20,102		20,102
Stock Repurchased and Retired During Period, Shares		(998,000)
Stock Repurchased and Retired During Period, Value	(124,542)	$ (499)	(9,348)	(114,695)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		375,000
Stock Issued During Period, Value, Stock Options Exercised	21,590	$ 187	21,403
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		254,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(17,975)	$ 127	(18,102)
BALANCE, SHARES at May. 31, 2021		162,803,000
BALANCE at May. 31, 2021	$ 4,703,481	$ 81,401	1,527,876	3,209,958	(115,754)
BALANCE, SHARES at Feb. 28, 2021	163,172,333	163,172,000
BALANCE at Feb. 28, 2021	$ 4,364,613	$ 81,586	1,513,821	2,887,897	(118,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	991,461
Other Comprehensive Income (Loss), Net of Tax	$ 18,390
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(1,249,000)
BALANCE, SHARES at Nov. 30, 2021	161,871,923	161,872,000
BALANCE at Nov. 30, 2021	$ 5,109,796	$ 80,936	1,672,728	3,456,433	(100,301)
BALANCE, SHARES at May. 31, 2021		162,803,000
BALANCE at May. 31, 2021	4,703,481	$ 81,401	1,527,876	3,209,958	(115,754)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	285,267			285,267
Other Comprehensive Income (Loss), Net of Tax	3,411				3,411
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	14,116		14,116
Adjustments to Additional Paid in Capital, Other			90,183
Stock Issued During Period, Value, Acquisitions	90,571	$ 388
Stock Issued During Period, Shares, Acquisitions		776,000
Stock Repurchased and Retired During Period, Shares		(1,754,000)
Stock Repurchased and Retired During Period, Value	(220,045)	$ (877)	(17,164)	(202,004)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		621,000
Stock Issued During Period, Value, Stock Options Exercised	38,496	$ 311	38,185
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		24,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(118)	$ 12	(130)
BALANCE, SHARES at Aug. 31, 2021		162,470,000
BALANCE at Aug. 31, 2021	4,915,179	$ 81,235	1,653,066	3,293,221	(112,343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	269,438			269,438
Other Comprehensive Income (Loss), Net of Tax	12,042				12,042
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	12,347		12,347
Stock Repurchased and Retired During Period, Shares		(851,000)
Stock Repurchased and Retired During Period, Value	(115,346)	$ (425)	(8,695)	(106,226)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		253,000
Stock Issued During Period, Value, Stock Options Exercised	16,223	$ 126	16,097
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ (87)	$ 0	(87)
BALANCE, SHARES at Nov. 30, 2021	161,871,923	161,872,000
BALANCE at Nov. 30, 2021	$ 5,109,796	$ 80,936	$ 1,672,728	$ 3,456,433	$ (100,301)