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	147,146				147,146
Other comprehensive income (loss)	2,736
Dividends	(28,480)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(2,463)		(22,230)			$ 19,767
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						1,136,951
Stock-based compensation	12,533		12,533
Contribution from noncontrolling interest	16						16
Reclassification of share-based liability awards	2,510		2,510
Ending balance at Feb. 29, 2020	1,758,055	$ 1,290	351,481	(121,390)	1,704,045	$ (177,583)	212
Ending balance, shares at Feb. 29, 2020		129,060,664
Ending balance, treasury stock, shares at Feb. 29, 2020						(9,998,775)
Beginning balance at Nov. 30, 2019	1,701,697	$ 1,290	347,192	(116,585)	1,654,489	$ (184,885)	196
Beginning balance, shares at Nov. 30, 2019		129,060,664
Beginning balance, treasury stock, shares at Nov. 30, 2019						(10,410,799)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	63,798
Other comprehensive income (loss)	(4,805)
Dividends	(14,242)				(14,242)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	5,354		(1,948)			$ 7,302
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						412,024
Stock-based compensation	6,237		6,237
Contribution from noncontrolling interest	16						16
Ending balance at Feb. 29, 2020	1,758,055	$ 1,290	351,481	(121,390)	1,704,045	$ (177,583)	212
Ending balance, shares at Feb. 29, 2020		129,060,664
Ending balance, treasury stock, shares at Feb. 29, 2020						(9,998,775)
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	$ 130,450				130,450
Other comprehensive income (loss)	1,624
Dividends	(28,833)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(4,536)		(25,647)			$ 21,111
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						1,287,310
Stock-based compensation	15,935		15,935
Contribution from noncontrolling interest	19						19
Reclassification of share-based liability awards	5,420		5,420
Ending balance at Feb. 28, 2021	$ 2,009,492	$ 1,290	354,620	(102,140)	1,909,443	$ (153,952)	231
Ending balance, shares at Feb. 28, 2021	129,060,664	129,060,664
Ending balance, treasury stock, shares at Feb. 28, 2021	(8,552,449)					(8,552,449)
Beginning balance at Nov. 30, 2020	$ 1,934,899	$ 1,290	348,816	(111,055)	1,857,513	$ (161,877)	212
Beginning balance, shares at Nov. 30, 2020		129,060,664
Beginning balance, treasury stock, shares at Nov. 30, 2020						(8,992,643)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	66,357
Other comprehensive income (loss)	8,915
Dividends	(14,427)				(14,427)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	5,805		(2,120)			$ 7,925
Issuance of stock under incentive and purchase plans, net of forfeitures, shares						440,194
Stock-based compensation	7,924		7,924
Contribution from noncontrolling interest	19						19
Ending balance at Feb. 28, 2021	$ 2,009,492	$ 1,290	$ 354,620	$ (102,140)	$ 1,909,443	$ (153,952)	$ 231
Ending balance, shares at Feb. 28, 2021	129,060,664	129,060,664
Ending balance, treasury stock, shares at Feb. 28, 2021	(8,552,449)					(8,552,449)