Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
May 31, 2020
Aug. 31, 2019
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 117,183 $ 112,014
Gross Carrying Value 180,016 164,389
Net Book Value 62,833 52,375
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 24,192 20,420
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 14 years  
Gross Carrying Value $ 138,749 126,229
Accumulated Amortization 102,344 96,817
Net Book Value $ 36,405 29,412
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 12 years  
Gross Carrying Value $ 13,922 13,227
Accumulated Amortization 12,769 12,276
Net Book Value $ 1,153 951
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 12 years  
Gross Carrying Value $ 3,153 4,513
Accumulated Amortization 2,070 2,921
Net Book Value $ 1,083 $ 1,592