CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock	Noncontrolling Interests
Beginning balance at Aug. 31, 2019	$ 1,624,057	$ 1,290	$ 358,668	$ (124,126)	$ 1,585,379	$ (197,350)	$ 196
Beginning balance, shares at Aug. 31, 2019		129,060,664
Beginning balance, treasury stock, shares at Aug. 31, 2019						(11,135,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	211,880				211,880
Other comprehensive income (loss)	(10,531)
Dividends	(42,768)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,921)		(21,751)			$ 19,830
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						1,140,195
Stock-based compensation	17,419		17,419
Contribution from noncontrolling interest	16						16
Reclassification of share-based liability awards	2,510		2,510
Ending balance at May. 31, 2020	1,800,662	$ 1,290	356,846	(134,657)	1,754,491	$ (177,520)	212
Ending balance, shares at May. 31, 2020		129,060,664
Ending balance, treasury stock, shares at May. 31, 2020						(9,995,531)
Beginning balance at Feb. 29, 2020	1,758,055	$ 1,290	351,481	(121,390)	1,704,045	$ (177,583)	212
Beginning balance, shares at Feb. 29, 2020		129,060,664
Beginning balance, treasury stock, shares at Feb. 29, 2020						(9,998,775)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	64,734
Other comprehensive income (loss)	(13,267)
Dividends	(14,288)				(14,288)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	542		479			$ 63
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						3,244
Stock-based compensation	4,886		4,886
Ending balance at May. 31, 2020	1,800,662	$ 1,290	356,846	(134,657)	1,754,491	$ (177,520)	212
Ending balance, shares at May. 31, 2020		129,060,664
Ending balance, treasury stock, shares at May. 31, 2020						(9,995,531)
Beginning balance at Aug. 31, 2020	$ 1,889,413	$ 1,290	358,912	(103,764)	1,807,826	$ (175,063)	212
Beginning balance, shares at Aug. 31, 2020	129,060,664	129,060,664
Beginning balance, treasury stock, shares at Aug. 31, 2020	(9,839,759)					(9,839,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 260,552				260,552
Other comprehensive income (loss)	24,914
Dividends	(43,295)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3,807)		(26,280)			$ 22,473
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						1,364,866
Stock-based compensation	23,381		23,381
Contribution from noncontrolling interest	19						19
Reclassification of share-based liability awards	5,420		5,420
Ending balance at May. 31, 2021	$ 2,156,597	$ 1,290	361,433	(78,850)	2,025,083	$ (152,590)	231
Ending balance, shares at May. 31, 2021	129,060,664	129,060,664
Ending balance, treasury stock, shares at May. 31, 2021	(8,474,893)					(8,474,893)
Beginning balance at Feb. 28, 2021	$ 2,009,492	$ 1,290	354,620	(102,140)	1,909,443	$ (153,952)	231
Beginning balance, shares at Feb. 28, 2021		129,060,664
Beginning balance, treasury stock, shares at Feb. 28, 2021						(8,552,449)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	130,408
Other comprehensive income (loss)	23,290
Dividends	(14,768)				(14,768)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	729		(633)			$ 1,362
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						77,556
Stock-based compensation	7,446		7,446
Ending balance at May. 31, 2021	$ 2,156,597	$ 1,290	$ 361,433	$ (78,850)	$ 2,025,083	$ (152,590)	$ 231
Ending balance, shares at May. 31, 2021	129,060,664	129,060,664
Ending balance, treasury stock, shares at May. 31, 2021	(8,474,893)					(8,474,893)