ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI by Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ (124,126)	$ (93,677)	$ (81,513)
Other comprehensive income (loss) before reclassifications	17,624	(33,071)	(14,454)
Amounts reclassified from AOCI	(369)	2,222	2,563
Income taxes (benefit)	3,107	400	(273)
Other comprehensive income (loss)	20,362	(30,449)	(12,164)
Balance	(103,764)	(124,126)	(93,677)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(121,498)	(92,637)	(80,778)
Other comprehensive income (loss) before reclassifications	33,559	(29,718)	(13,938)
Amounts reclassified from AOCI	6	857	2,079
Income taxes (benefit)	0	0	0
Other comprehensive income (loss)	33,565	(28,861)	(11,859)
Balance	(87,933)	(121,498)	(92,637)
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	1,106	1,356	1,587
Other comprehensive income (loss) before reclassifications	(14,983)	(7)	59
Amounts reclassified from AOCI	(375)	(301)	(365)
Income taxes (benefit)	2,918	58	75
Other comprehensive income (loss)	(12,440)	(250)	(231)
Balance	(11,334)	1,106	1,356
Defined Benefit Obligation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(3,734)	(2,396)	(2,322)
Other comprehensive income (loss) before reclassifications	(952)	(3,346)	(575)
Amounts reclassified from AOCI	0	1,666	849
Income taxes (benefit)	189	342	(348)
Other comprehensive income (loss)	(763)	(1,338)	(74)
Balance	$ (4,497)	$ (3,734)	$ (2,396)