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Financing Arrangements (Details)
$ in Millions, $ in Millions
Sep. 25, 2019
USD ($)
Oct. 18, 2017
CAD ($)
facility
Nov. 30, 2019
USD ($)
May 31, 2019
USD ($)
Financing Arrangements        
Total debt     $ 198.3 $ 142.9
Debt issuance costs, net     (2.2) (1.2)
Long-term debt     196.1 141.7
Number of facilities acquired | facility   2    
Term Loan        
Financing Arrangements        
Total debt     23.3 22.9
Maximum borrowing capacity   $ 31    
CDOR | Minimum | Term Loan        
Financing Arrangements        
Basis spread on variable rate (as a percent)   1.25%    
CDOR | Maximum | Term Loan        
Financing Arrangements        
Basis spread on variable rate (as a percent)   2.25%    
Eurodollar rate | Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Minimum        
Financing Arrangements        
Basis spread on variable rate (as a percent) 0.875%      
Eurodollar rate | Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Maximum        
Financing Arrangements        
Basis spread on variable rate (as a percent) 1.75%      
Base rate | Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Minimum        
Financing Arrangements        
Basis spread on variable rate (as a percent) 0.00%      
Base rate | Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Maximum        
Financing Arrangements        
Basis spread on variable rate (as a percent) 0.75%      
Prime Rate | Minimum | Term Loan        
Financing Arrangements        
Basis spread on variable rate (as a percent)   0.25%    
Prime Rate | Maximum | Term Loan        
Financing Arrangements        
Basis spread on variable rate (as a percent)   1.25%    
Revolving credit facility        
Financing Arrangements        
Total debt     $ 175.0 $ 120.0
Current borrowing capacity $ 600.0      
Increase in borrowing capacity 300.0      
Maximum borrowing capacity $ 900.0