Annual report pursuant to Section 13 and 15(d)

Gross Carrying Value and Accumulated Amortization of Intangible Assets (Details)

v3.10.0.1
Gross Carrying Value and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Accumulated Amortization $ 193,941 $ 192,660
Net Book Value 181,037 220,489
Intangible assets, gross 374,978 413,149
Trade Names    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 87,253 91,080
Finite-Lived Accumulated Amortization 0 0
Net Book Value 87,253 91,080
Customer Relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 230,601 263,498
Finite-Lived Accumulated Amortization 147,451 153,003
Net Book Value $ 83,150 110,495
Weighted Average Amortization Period 15 years  
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 30,355 30,401
Finite-Lived Accumulated Amortization 25,327 24,027
Net Book Value $ 5,028 6,374
Weighted Average Amortization Period 11 years  
Trademarks and Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 20,823 21,498
Finite-Lived Accumulated Amortization 15,347 9,396
Net Book Value $ 5,476 12,102
Weighted Average Amortization Period 18 years  
Non-Compete Agreements and Other    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 5,946 6,672
Finite-Lived Accumulated Amortization 5,816 6,234
Net Book Value $ 130 $ 438
Weighted Average Amortization Period 3 years