CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 30,343	$ 17,221
Property, plant and equipment, accumulated depreciation	4,221,124	4,110,496
Intangible assets, accumulated amortization	$ 353,988	$ 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	262,337,466	260,406,796
Common stock, shares outstanding	152,300,356	153,520,380
Treasury stock, shares	110,037,110	106,886,416