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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 13,975 $ 14,134
Property, plant and equipment, accumulated depreciation 3,406,924 3,125,390
Intangible assets, accumulated amortization $ 289,837 $ 269,212
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 256,566,035 253,266,684
Common stock, shares outstanding 172,063,230 177,727,653
Treasury stock, shares 84,502,805 75,539,031