CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Feb. 29, 2020	Aug. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 30,191	$ 17,221
Property, plant and equipment, accumulated depreciation	4,344,338	4,110,496
Intangible assets, accumulated amortization	$ 367,299	$ 337,841
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	263,299,124	260,406,796
Common stock, shares outstanding	151,407,526	153,520,380
Treasury stock, shares	111,891,598	106,886,416