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
Feb. 28, 2018
Aug. 31, 2017
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 205,067 $ 192,660
Gross Carrying Value 421,437 413,149
Net Book Value 216,370 220,489
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Net Book Value 94,621 91,080
Gross Carrying Value $ 94,621 91,080
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 268,105 263,498
Accumulated Amortization 163,676 153,003
Net Book Value $ 104,429 110,495
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 10 years  
Gross Carrying Value $ 30,538 30,401
Accumulated Amortization 24,918 24,027
Net Book Value $ 5,620 6,374
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 18 years  
Gross Carrying Value $ 21,396 21,498
Accumulated Amortization 10,015 9,396
Net Book Value $ 11,381 12,102
Other intangibles    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Gross Carrying Value $ 6,777 6,672
Accumulated Amortization 6,458 6,234
Net Book Value $ 319 $ 438