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Financing Arrangements (Details)
$ in Millions
12 Months Ended
Oct. 18, 2017
USD ($)
facility
Sep. 19, 2017
facility
May 31, 2019
USD ($)
May 31, 2018
USD ($)
May 31, 2017
USD ($)
Mar. 24, 2015
USD ($)
Financing Arrangements            
Total debt     $ 142.9 $ 178.9    
Debt issuance costs, net     (1.2) (1.7)    
Long-term debt     141.7 177.2    
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     22.9 23.9    
Maximum borrowing capacity $ 31.0          
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     $ 120.0 130.0    
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 due August 1, 2018            
Financing Arrangements            
Total debt       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     287.0 275.0 $ 217.0  
Average daily borrowings     $ 207.8 $ 214.1 $ 175.5  
Average interest rate during the year (as a percent)     3.41% 2.52% 1.77%  
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     $ 9.5