CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	May 31, 2021	Aug. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 26,939	$ 25,827
Property, plant and equipment, accumulated depreciation	4,922,191	4,525,758
Intangible assets, accumulated amortization	$ 430,994	$ 395,074
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	266,865,062	263,830,270
Common stock, shares outstanding	146,837,466	150,330,358
Treasury stock at cost, shares	120,027,596	113,499,912