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, 2020
Aug. 31, 2020
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 123,994 $ 121,976
Gross Carrying Value 184,091 184,358
Net Book Value $ 60,097 62,382
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 14 years  
Gross Carrying Value $ 141,657 141,853
Accumulated Amortization 108,358 106,491
Net Book Value $ 33,299 35,362
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 12 years  
Gross Carrying Value $ 14,350 14,365
Accumulated Amortization 13,361 13,228
Net Book Value $ 989 1,137
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 12 years  
Gross Carrying Value $ 3,264 3,277
Accumulated Amortization 2,275 2,257
Net Book Value 989 1,020
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value 24,820 24,863
Accumulated Amortization 0 0
Net Book Value $ 24,820 $ 24,863