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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2018 USD ($) levels | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Sep. 01, 2018 USD ($)
Retainage included in accounts receivable | $ 41,800 | $ 43,200 |  |
Goodwill impairment | 515 | 1,982 |  |
Goodwill | 64,310 | 64,915 | $ 66,373 |
Transaction gains (losses) | $ 1,800 | 2,000 | $ (15,600) |
Number of fair value hierarchy | levels | 3 |  |  |
One reporting unit within Americas Fabrication |  |  |  |
Goodwill | $ 51,100 | $ 51,600 |  |
Receivables secured by credit insurance or letters of credit |  |  |  |
Percentage of accounts receivable secured by credit insurance or letters of credit | 18.00% | 28.00% |  |
Certain fabrication projects |  |  |  |
Sales recognized in excess of amounts billed | $ 49,200 | $ 23,100 |  |
Forecast | Accounting Standards Update 2014-09 |  |  |  |
Cumulative effect of new accounting principle on retained earnings |  |  |  | $ 2,700

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