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, 2017
Aug. 31, 2016
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 216,707 $ 202,311
Other intangibles, gross 439,993 441,786
Other intangibles, net 223,286 239,475
Tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Gross Carrying Value $ 90,651 90,909
Customer relationships    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 15 years  
Gross Carrying Value $ 291,307 292,671
Accumulated Amortization 178,168 166,252
Net Book Value $ 113,139 126,419
Patents    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 11 years  
Gross Carrying Value $ 30,204 30,296
Accumulated Amortization 23,558 22,233
Net Book Value $ 6,646 8,063
Trademarks and tradenames    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 18 years  
Gross Carrying Value $ 21,236 21,283
Accumulated Amortization 8,891 7,936
Net Book Value $ 12,345 13,347
Other intangibles    
Indefinite And Finite Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Gross Carrying Value $ 6,595 6,627
Accumulated Amortization 6,090 5,890
Net Book Value $ 505 $ 737