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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | May 31, 2019 | Aug. 31, 2018
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Condensed Consolidated Balance Sheets [Abstract] |  |
Allowance for doubtful accounts | $ 4,170 | $ 3,555
Common stock, par value | $ 0.05 | $ 0.05
Common stock, shares authorized | 40,000,000 | 40,000,000
Common stock, shares issued | 27,056,000 | 27,056,000
Treasury stock, shares | 13,097,000 | 13,159,000

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