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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