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Debt and Lines of Credit - Debt (Details) - USD ($)
Dec. 01, 2009
Aug. 31, 2019
Aug. 31, 2018
Debt Instrument [Line Items]      
Total debt outstanding   $ 356,600,000 $ 356,800,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2020   350,300,000  
2021   4,400,000  
2022   400,000  
2023   400,000  
2024   300,000  
After 2024   900,000  
Senior Unsecured Notes | Unsecured Notes      
Debt Instrument [Line Items]      
Total debt outstanding   350,000,000.0 350,000,000.0
Senior unsecured public notes due December 2019, unamortized discount and deferred costs   (100,000) (500,000)
Carrying value of debt to be refinanced   341,200,000  
Senior Unsecured Notes | Unsecured Notes | ABL      
Debt Instrument [Line Items]      
Aggregate principal amount of unsecured notes $ 350,000,000.0    
Interest rate (percent) 6.00%    
Senior unsecured notes, discount rate 99.797%    
Senior unsecured notes, maturity terms (years) 10 years    
Capitalized deferred issuance costs $ 3,100,000    
Term of notes 10 years    
Industrial Revenue Bond | Industrial revenue bond      
Debt Instrument [Line Items]      
Total debt outstanding   $ 4,000,000.0 4,000,000.0
Long-term debt interest rate (percent)   1.70%  
Bank loans | Fixed-rate Bank Loans      
Debt Instrument [Line Items]      
Total debt outstanding   $ 2,700,000 $ 3,300,000
Minimum | Bank loans | Fixed-rate Bank Loans      
Debt Instrument [Line Items]      
Interest rate (percent)   0.80%  
Maximum | Bank loans | Fixed-rate Bank Loans      
Debt Instrument [Line Items]      
Interest rate (percent)   2.00%