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BUSINESS SEGMENTS (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 | [1] | May 31, 2019 | [1] | Feb. 28, 2019 | [1] | Nov. 30, 2018 | [1] | Aug. 31, 2018 | May 31, 2018 | [1] | Feb. 28, 2018 | [1] | Nov. 30, 2017 | [1] | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,543,005 | $ 1,605,872 | $ 1,402,783 | $ 1,277,342 | $ 1,308,438 | $ 1,204,484 | $ 1,054,268 | $ 1,076,533 | $ 5,829,002 | $ 4,643,723 | $ 3,844,069
Steel products |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,481,622 | 3,114,227 | 2,584,359
Nonferrous scrap |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 518,687 | 630,609 | 506,220
Ferrous scrap |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 447,530 | 550,602 | 413,441
Construction materials |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 259,685 | 249,538 | 228,910
Other |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 121,478 | $ 98,747 | $ 111,139
[1] | Excludes discontinued operations.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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