Quarterly report pursuant to Section 13 or 15(d)

Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details)

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Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Aug. 31, 2018
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 151,964 $ 193,941
Gross Carrying Value 304,683 374,978
Net Book Value 152,719 181,037
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Net Book Value 83,531 87,253
Gross Carrying Value $ 83,531 87,253
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 188,316 230,601
Accumulated Amortization 123,129 147,451
Net Book Value $ 65,187 83,150
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 11 years  
Gross Carrying Value $ 20,831 30,355
Accumulated Amortization 18,757 25,327
Net Book Value $ 2,074 5,028
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 6,862 20,823
Accumulated Amortization 5,008 15,347
Net Book Value $ 1,854 5,476
Other intangibles    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Gross Carrying Value $ 5,143 5,946
Accumulated Amortization 5,070 5,816
Net Book Value $ 73 $ 130