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
May 31, 2018
Aug. 31, 2017
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 207,440 $ 192,660
Gross Carrying Value 417,600 413,149
Net Book Value 210,160 220,489
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Net Book Value 94,468 91,080
Gross Carrying Value $ 94,468 91,080
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 265,149 263,498
Accumulated Amortization 165,781 153,003
Net Book Value $ 99,368 110,495
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 10 years  
Gross Carrying Value $ 30,293 30,401
Accumulated Amortization 25,121 24,027
Net Book Value $ 5,172 6,374
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 18 years  
Gross Carrying Value $ 21,034 21,498
Accumulated Amortization 10,122 9,396
Net Book Value $ 10,912 12,102
Other intangibles    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Gross Carrying Value $ 6,656 6,672
Accumulated Amortization 6,416 6,234
Net Book Value $ 240 $ 438