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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Aug. 31, 2017 | Aug. 31, 2016
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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

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