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Financing Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2015
Aug. 31, 2015
Nov. 30, 2016
Nov. 30, 2015
May 31, 2016
Mar. 24, 2015
Financing Arrangements            
Total debt     $ 163.3   $ 150.1  
Current maturities of debt     (7.0)   (12.0)  
Debt issuance costs, net     (2.2)   (2.0)  
Long-term debt     154.1   136.1  
Loss on extinguishment of debt $ 0.1     $ 0.4    
Capital lease obligations            
Financing Arrangements            
Total debt     4.3   5.1  
Credit Facility Amendment            
Financing Arrangements            
Maximum borrowing capacity           $ 500.0
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly            
Financing Arrangements            
Total debt     129.0   110.0  
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  
Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1            
Financing Arrangements            
Total debt     5.0   $ 10.0  
Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1            
Financing Arrangements            
Amount of convertible notes repurchased $ 9.7 $ 14.4   $ 9.7    
Interest rate (as a percent) 2.25% 2.25%   2.25%    
Cash paid for convertible notes repurchased $ 9.7 $ 14.6   $ 9.7    
Accrued interest   0.2        
Loss on extinguishment of debt $ 0.1 $ 0.3        
Revolving credit facility | Credit Facility Amendment            
Financing Arrangements            
Increase in borrowing capacity     250.0      
Total borrowing capacity     $ 750.0