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Financing Arrangements (Details) - USD ($)
$ in Millions
Aug. 31, 2017
May 31, 2017
Financing Arrangements    
Total debt $ 192.9 $ 159.3
Current maturities of debt (2.0) (2.0)
Debt issuance costs, net (1.9) (2.0)
Long-term debt 189.0 155.3
Capital lease obligations    
Financing Arrangements    
Total debt 2.9 3.3
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly    
Financing Arrangements    
Total debt 165.0 131.0
Industrial revenue bond (secured by property, plant and equipment) due August 1, 2018 with interest payable monthly    
Financing Arrangements    
Total debt 25.0 $ 25.0
Variable rate and fixed rate debt | Significant other observable inputs (Level 2)    
Financing Arrangements    
Estimated fair value of long-term debt $ 192.9