CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests	Cumulative effect adjustment for adoption of new accounting standards Retained Earnings
Beginning Balance at Aug. 31, 2018	$ 1,963,380	$ 257	$ 2,218,673	$ 1,760,097	$ (19,399)	$ (2,009,371)	$ 13,123	$ 40,855
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under employee stock purchase plan		1	14,582
Vesting of restricted stock		2	(2)
Recognition of stock-based compensation			46,156
Declared dividends				(38,487)
Net (loss) income	235,713			234,436			1,277
Other comprehensive loss	(30,606)				(30,606)
Purchases of treasury stock under employee stock plans						(11,898)
Treasury shares purchased						(350,323)
Acquisition of noncontrolling interests							1,112
Disposition of noncontrolling interests							(1,785)
Declared dividends to noncontrolling interests							(1,500)
Ending Balance at May. 31, 2019	1,867,200	260	2,279,409	1,996,901	(50,005)	(2,371,592)	12,227
Beginning Balance at Feb. 28, 2019	1,858,852	260	2,264,966	1,966,100	(13,253)	(2,370,898)	11,677
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under employee stock purchase plan			(5)
Recognition of stock-based compensation			14,448
Declared dividends				(12,681)
Net (loss) income	44,032			43,482			550
Other comprehensive loss	(36,752)				(36,752)
Purchases of treasury stock under employee stock plans						(694)
Ending Balance at May. 31, 2019	1,867,200	260	2,279,409	1,996,901	(50,005)	(2,371,592)	12,227
Beginning Balance at Aug. 31, 2019	1,900,758	260	2,304,552	2,037,037	(82,794)	(2,371,612)	13,315
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under employee stock purchase plan		1	16,179
Vesting of restricted stock		2	(2)
Recognition of stock-based compensation			59,365
Declared dividends				(37,672)
Net (loss) income	(12,130)			(13,819)			1,689
Other comprehensive loss	(66,609)				(66,609)
Purchases of treasury stock under employee stock plans						(23,086)
Treasury shares purchased						(189,500)
Declared dividends to noncontrolling interests							(2,002)
Ending Balance at May. 31, 2020	1,645,304	263	2,380,094	1,985,546	(149,403)	(2,584,198)	13,002
Beginning Balance at Feb. 29, 2020	1,759,140	263	2,363,839	2,048,954	(102,943)	(2,563,282)	12,309
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Recognition of stock-based compensation			16,255
Declared dividends				(12,450)
Net (loss) income	(50,263)			(50,958)			695
Other comprehensive loss	(46,460)				(46,460)
Purchases of treasury stock under employee stock plans						(75)
Treasury shares purchased						(20,841)
Declared dividends to noncontrolling interests							(2)
Ending Balance at May. 31, 2020	$ 1,645,304	$ 263	$ 2,380,094	$ 1,985,546	$ (149,403)	$ (2,584,198)	$ 13,002