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. 28, 2019		167,479,000
BALANCE at Feb. 28, 2019	$ 3,357,028	$ 83,739	$ 1,237,153	$ 2,104,146	$ (68,010)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	266,744			266,744
Other Comprehensive Income (Loss), Net of Tax	(13,196)				(13,196)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	18,912		18,912
Stock Repurchased and Retired During Period, Shares		(2,953,000)
Stock Repurchased and Retired During Period, Value	(204,835)	$ (1,476)	(21,991)	(181,368)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		727,000
Stock Issued During Period, Value, Stock Options Exercised	33,251	$ 363	32,888
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		142,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(5,149)	$ 71	(5,220)
BALANCE, SHARES at May. 31, 2019		165,395,000
BALANCE at May. 31, 2019	3,452,755	$ 82,697	1,261,742	2,189,522	(81,206)
BALANCE, SHARES at Feb. 28, 2019		167,479,000
BALANCE at Feb. 28, 2019	3,357,028	$ 83,739	1,237,153	2,104,146	(68,010)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	673,499
Other Comprehensive Income (Loss), Net of Tax	(13,997)
BALANCE, SHARES at Nov. 30, 2019		163,795,000
BALANCE at Nov. 30, 2019	3,698,053	$ 81,897	1,321,567	2,376,596	(82,007)
BALANCE, SHARES at May. 31, 2019		165,395,000
BALANCE at May. 31, 2019	3,452,755	$ 82,697	1,261,742	2,189,522	(81,206)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	233,599			233,599
Other Comprehensive Income (Loss), Net of Tax	(10,424)				(10,424)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	10,757		10,757
Stock Repurchased and Retired During Period, Shares		(1,526,000)
Stock Repurchased and Retired During Period, Value	(128,362)	$ (763)	(11,933)	(115,666)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		1,008,000
Stock Issued During Period, Value, Stock Options Exercised	53,270	$ 504	52,766
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		9,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(38)	$ 4	(42)
BALANCE, SHARES at Aug. 31, 2019		164,886,000
BALANCE at Aug. 31, 2019	3,611,557	$ 82,442	1,313,290	2,307,455	(91,630)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	173,156			173,156
Other Comprehensive Income (Loss), Net of Tax	9,623				9,623
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,745		8,745
Stock Repurchased and Retired During Period, Shares		(1,270,000)
Stock Repurchased and Retired During Period, Value	(114,820)	$ (635)	(10,170)	(104,015)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		178,000
Stock Issued During Period, Value, Stock Options Exercised	9,846	$ 89	9,757
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		1,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(54)	$ 1	(55)
BALANCE, SHARES at Nov. 30, 2019		163,795,000
BALANCE at Nov. 30, 2019	$ 3,698,053	$ 81,897	1,321,567	2,376,596	(82,007)
BALANCE, SHARES at Feb. 29, 2020	163,081,376	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	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)
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect | Accounting Standards Update 2016-13 [Member]	(153,306)			(153,306)
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	163,081,376	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)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(1,481,000)
BALANCE, SHARES at Nov. 30, 2020	163,033,971	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	163,033,971	163,034,000
BALANCE at Nov. 30, 2020	$ 4,128,476	$ 81,517	$ 1,462,130	$ 2,737,753	$ (152,924)