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Financing Arrangements (Details)
$ in Millions
12 Months Ended
Dec. 14, 2022
USD ($)
Oct. 18, 2017
USD ($)
facility
May 31, 2023
USD ($)
May 31, 2022
USD ($)
May 31, 2021
USD ($)
Financing Arrangements          
Revolving Credit Facility with interest payable monthly     $ 272.0 $ 100.0  
Debt issuance costs, net     (2.3) (1.1)  
Long-term debt     269.7 98.9  
Term loan          
Financing Arrangements          
Maximum borrowing capacity   $ 31.0      
Foreign Line of Credit          
Financing Arrangements          
Credit agreement     9.2    
Revolving Credit Facility | Revolving credit facility expiring September 25, 2024 with interest payable monthly          
Financing Arrangements          
Revolving Credit Facility with interest payable monthly     272.0    
Remaining borrowing capacity     336.9    
Revolving Credit Facility | Revolving credit facility expiring September 25, 2024 with interest payable monthly | Letter of Credit          
Financing Arrangements          
Revolving Credit Facility with interest payable monthly     11.1    
Revolving Credit Facility | Revolving Credit Facility expiring December, 2027          
Financing Arrangements          
Maximum borrowing capacity $ 620.0        
Line of credit facility, Additional borrowing capacity 300.0        
Line of credit facility, Maximum additional borrowing capacity $ 920.0        
Maximum amount borrowed     350.0 124.5 $ 579.5
Average daily borrowings     $ 210.2 $ 105.9 $ 257.5
Average interest rate during the year     5.11% 1.09% 1.20%
Revolving Credit Facility | Eurodollar rate | Revolving Credit Facility expiring December, 2027 | Minimum          
Financing Arrangements          
Debt instrument basis spread on variable rate after amendment 1.125%        
Revolving Credit Facility | Eurodollar rate | Revolving Credit Facility expiring December, 2027 | Maximum          
Financing Arrangements          
Debt instrument basis spread on variable rate after amendment 2.00%        
Revolving Credit Facility | Base rate | Revolving Credit Facility expiring December, 2027 | Minimum          
Financing Arrangements          
Debt instrument basis spread on variable rate after amendment 0.125%        
Revolving Credit Facility | Base rate | Revolving Credit Facility expiring December, 2027 | Maximum          
Financing Arrangements          
Debt instrument basis spread on variable rate after amendment 1.00%        
MRO facilities acquired in Canada owned by Premier Aviation          
Financing Arrangements          
Number of facilities acquired | facility   2