CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	May 31, 2017	Aug. 31, 2016
CONSOLIDATED BALANCE SHEETS [Abstract]
Receivables, allowance for doubtful account	$ 7	$ 7
Prepaid expenses and other current assets, fair value of derivative	3	34
Other non-current assets, fair value of derivative instruments	2,679	3,224
Other accrued expenses, fair value of foreign currency forward contracts	400	144
Other long-term liabilities, fair value of derivative instruments	600	1,514
Other long-term liabilities, defined benefit plan	$ 4,806	$ 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	31,258,752	31,237,658
Common stock, shares outstanding	30,398,239	30,401,307
Treasury stock, shares	860,513	836,351