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Other Assets - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
Aug. 31, 2015
Finite-Lived Intangible Assets [Line Items]                    
Goodwill $ 138,464       $ 138,454       $ 144,284  
Customer lists, trademarks and other intangible assets 29,338       33,330          
Notes receivable 211,986       51,586          
Deferred purchase price receivable 0       345,655          
Long-term derivative assets 23,084       40,897          
Prepaid pension and other benefits 101,539       122,433          
Capitalized major maintenance 130,780       105,006       $ 169,054 $ 241,588
Cash value life insurance 123,010       118,677          
Other 76,128       124,343          
Other assets 834,329 $ 960,240 $ 943,552 $ 997,402 1,080,381 $ 955,532 $ 1,056,873 $ 1,054,454    
Customer lists, trademarks and other intangible assets                    
Finite-Lived Intangible Assets [Line Items]                    
Customer lists, trademarks and other intangible assets $ 29,338       $ 33,330