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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | May 31, 2018 | [1] | Feb. 28, 2018 | [1] | Nov. 30, 2017 | [1] | Aug. 31, 2017 | May 31, 2017 | [1] | Feb. 28, 2017 | [1] | Nov. 30, 2016 | [1] | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 1,308,438 | [1] | $ 1,204,484 | $ 1,054,268 | $ 1,076,533 | $ 1,084,130 | $ 1,044,713 | $ 862,298 | $ 852,928 | $ 4,643,723 | $ 3,844,069 | $ 3,596,068
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 352,221 | 235,822 | 305,237
Interest expense |  |  |  |  |  |  |  |  |  |  | 40,957 | 44,151 | 62,973
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 174,655 | 213,120 | 163,332
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | (131,508) | (124,490) | (126,259)
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 14,372 | 1,730 | 40,028
Total assets |  | 3,328,304 |  |  |  |  | 2,975,131 |  |  |  | 3,328,304 | 2,975,131 |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 4,643,723 | 3,844,069 | 3,596,068
Americas Recycling |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,117,714 | 865,462 | 594,316
Americas Mills |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,204,181 | 917,689 | 839,432
Americas Fabrication |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,416,572 | 1,364,826 | 1,479,125
International Mill |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 885,919 | 636,402 | 520,288
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 19,337 | 59,690 | 162,907
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 4,643,723 | 3,844,069 | 3,596,068
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 352,221 | 235,822 | 305,237
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 40,957 | 44,151 | 62,973
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 171,367 | 213,074 | 163,060
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 14,372 | 1,730 | 40,028
Total assets | [4] | 3,328,304 |  |  |  |  | 2,975,131 |  |  |  | 3,328,304 | 2,975,131 | 3,130,869
Segments | Americas Recycling |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,365,429 | 1,011,500 | 705,795
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 68,694 | 33,541 | (2,975)
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 3,605 | 2,979 | 2,210
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 8,592 | 7,148 | 4,891
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 17,246 | 15,501 | 17,923
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 180 | 559 | 38,900
Total assets | [4] | 291,838 |  |  |  |  | 240,371 |  |  |  | 291,838 | 240,371 | 195,532
Segments | Americas Mills |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,996,903 | 1,565,454 | 1,498,848
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 301,805 | 224,183 | 262,192
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 5,317 | (3,394) | 1,942
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 121,029 | 172,738 | 110,375
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 61,512 | 49,419 | 47,924
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 8 | 0 | 0
Total assets | [4] | 1,115,339 |  |  |  |  | 933,022 |  |  |  | 1,115,339 | 933,022 | 798,481
Segments | Americas Fabrication |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,427,882 | 1,375,928 | 1,489,455
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | (39,394) | 27,259 | 90,467
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 14,295 | 9,899 | 8,356
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 14,386 | 15,495 | 14,958
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 13,537 | 13,400 | 13,620
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 14,157 | 0 | 0
Total assets | [4] | 739,151 |  |  |  |  | 683,609 |  |  |  | 739,151 | 683,609 | 659,165
Segments | International Mill |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 887,038 | 637,273 | 520,831
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 131,720 | 76,068 | 57,553
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 2,699 | 3,079 | 2,705
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 23,552 | 12,603 | 27,155
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 27,255 | 25,830 | 25,911
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 27 | 150 | 208
Total assets | [4] | 485,548 |  |  |  |  | 464,428 |  |  |  | 485,548 | 464,428 | 378,248
Segments | Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 19,337 | 61,001 | 241,131
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | (110,604) | (125,229) | (102,000)
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 15,041 | 31,588 | 47,760
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 3,808 | 5,090 | 5,681
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 11,958 | 20,340 | 20,881
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 0 | 1,021 | 920
Total assets | [4] | 1,173,869 |  |  |  |  | 981,584 |  |  |  | 1,173,869 | 981,584 | 1,526,642
Segments | Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | (1,052,866) | (807,087) | (859,992)
Adjusted operating profit (loss) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense | [2] |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures | [3] |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | [4] | $ (477,441) |  |  |  |  | $ (327,883) |  |  |  | (477,441) | (327,883) | (427,199)
Intersegment | Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment | Americas Recycling |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 247,715 | 146,038 | 111,479
Intersegment | Americas Mills |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 792,722 | 647,765 | 659,416
Intersegment | Americas Fabrication |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 11,310 | 11,102 | 10,330
Intersegment | International Mill |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 1,119 | 871 | 543
Intersegment | Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 0 | 1,311 | 78,224
Intersegment | Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | $ (1,052,866) | $ (807,087) | $ (859,992)
[1] | Excludes discontinued operations. See Note 3, Changes in Business
[2] | Includes intercompany interest expense (income) in the segments, which is eliminated within Corporate and Other.
[3] | Excludes immaterial capital expenditures from discontinued operations for the years ended August 31, 2018, 2017 and 2016.
[4] | Total assets listed in Corporate and Other includes assets from discontinued operations

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