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

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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