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, 2017
Aug. 31, 2017
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 198,686 $ 192,660
Gross Carrying Value 414,718 413,149
Net Book Value 216,032 220,489
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Net Book Value 91,825 91,080
Gross Carrying Value $ 91,825 91,080
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 264,409 263,498
Accumulated Amortization 158,245 153,003
Net Book Value $ 106,164 110,495
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 10 years  
Gross Carrying Value $ 30,448 30,401
Accumulated Amortization 24,476 24,027
Net Book Value $ 5,972 6,374
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 18 years  
Gross Carrying Value $ 21,324 21,498
Accumulated Amortization 9,637 9,396
Net Book Value $ 11,687 12,102
Other intangibles    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Gross Carrying Value $ 6,712 6,672
Accumulated Amortization 6,328 6,234
Net Book Value $ 384 $ 438