CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
CONSOLIDATED BALANCE SHEETS [Abstract]
Receivables, allowance for doubtful account	$ 7	$ 7
Other non-current assets, fair value of derivative instruments	2,547	3,224
Other accrued expenses, fair value of foreign currency forward contracts	0	110
Other long-term liabilities, fair value of derivative instruments	682	1,514
Other long-term liabilities, defined benefit plan	$ 5,051	$ 4,013
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	31,275,727	31,237,658
Common stock, shares outstanding	30,400,742	30,401,307
Treasury stock, shares	874,985	836,531