CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 31, 2018
CONSOLIDATED BALANCE SHEETS [Abstract]
Receivables, net of allowance for doubtful accounts	$ 144	$ 97
Prepaid expenses and other current assets, fair value of derivative instruments	2,736	0
Other non-current assets, fair value of derivative instruments	0	4,364
Other long-term liabilities, fair value of derivative instruments	2,910	502
Other long-term liabilities, post-employment plans	$ 5,421	$ 4,715
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	31,461,359	31,372,752
Common stock, shares outstanding	30,538,788	30,460,353
Treasury stock, shares	924,332	912,399