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Financing Arrangements (Details)
$ in Millions
12 Months Ended
Oct. 18, 2017
USD ($)
facility
Sep. 19, 2017
facility
May 31, 2018
USD ($)
May 31, 2017
USD ($)
May 31, 2016
USD ($)
Mar. 24, 2015
USD ($)
Financing Arrangements            
Total debt     $ 178.9 $ 156.2    
Current maturities of debt       (0.1)    
Debt issuance costs, net     (1.7) (2.0)    
Long-term debt     177.2 154.1    
CDOR | Minimum            
Financing Arrangements            
Basis spread on variable rate (as a percent) 1.25%          
CDOR | Maximum            
Financing Arrangements            
Basis spread on variable rate (as a percent) 2.25%          
Prime Rate | Minimum            
Financing Arrangements            
Basis spread on variable rate (as a percent) 0.25%          
Prime Rate | Maximum            
Financing Arrangements            
Basis spread on variable rate (as a percent) 1.25%          
Credit Facility Amendment            
Financing Arrangements            
Maximum borrowing capacity           $ 500.0
Term loan due November 1, 2021 with interest payable monthly            
Financing Arrangements            
Total debt     23.9      
Maximum borrowing capacity $ 31.0          
Capital lease obligations            
Financing Arrangements            
Total debt       0.2    
MRO facilities acquired in Canada owned by Premier Aviation            
Financing Arrangements            
Number of facilities acquired | facility 2 2        
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly            
Financing Arrangements            
Total debt     $ 130.0 131.0    
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Eurodollar rate | Minimum            
Financing Arrangements            
Basis spread on variable rate under the credit agreement after amendment (as a percent)     1.00%      
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Eurodollar rate | Maximum            
Financing Arrangements            
Basis spread on variable rate under the credit agreement after amendment (as a percent)     2.00%      
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Base rate | Minimum            
Financing Arrangements            
Basis spread on variable rate under the credit agreement after amendment (as a percent)     0.00%      
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly | Base rate | Maximum            
Financing Arrangements            
Basis spread on variable rate under the credit agreement after amendment (as a percent)     1.00%      
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    
Revolving credit facility | Credit Facility Amendment            
Financing Arrangements            
Increase in borrowing capacity     250.0      
Total borrowing capacity     750.0      
Credit Agreement and its Predecessor            
Short-term borrowing activity            
Maximum amount borrowed     275.0 217.0 $ 200.0  
Average daily borrowings     $ 214.1 $ 175.5 $ 134.2  
Average interest rate during the year (as a percent)     2.52% 1.77% 1.41%  
Secured credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly            
Short-term borrowing activity            
Amount outstanding     $ 9.9