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Financing Arrangements (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2015
May 31, 2017
May 31, 2016
May 31, 2015
Mar. 24, 2015
Financing Arrangements          
Total debt   $ 159.3 $ 150.1    
Current maturities of debt   (2.0) (12.0)    
Debt issuance costs, net   (2.0) (2.0)    
Long-term debt   155.3 136.1    
Short-term borrowing activity          
Loss on extinguishment of debt     0.4 $ 44.9  
Credit Facility Amendment          
Financing Arrangements          
Maximum borrowing capacity         $ 500.0
Capital lease obligations          
Financing Arrangements          
Total debt   3.3 5.1    
New capital leases related to new aircraft and IT equipment     5.1    
Revolving Credit Facility expiring November 1, 2021 with interest payable monthly          
Financing Arrangements          
Total debt   $ 131.0 110.0    
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    
Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1          
Financing Arrangements          
Total debt     10.0    
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   9.6      
Notes payable due January 15, 2022 with interest at 7.25% payable semi-annually on January 15 and July 15          
Financing Arrangements          
Interest rate (as a percent) 7.25%        
Short-term borrowing activity          
Redemption value of senior notes $ 325.0        
Redemption value including make-whole premium 370.6        
Loss on extinguishment of debt 44.9        
Make-whole premium of redeemed notes 45.6        
Unamortized deferred financing cost 6.2        
Unamortized deferred cost offset $ 6.9        
Convertible notes payable          
Interest expense          
Coupon interest     0.6 1.5  
Amortization of deferred financing fees     0.1 0.1  
Amortization of discount     1.3 2.4  
Interest expense related to convertible notes     2.0 4.0  
Variable rate and fixed rate debt | Significant other observable inputs (Level 2)          
Financing Arrangements          
Estimated fair value of long-term debt   156.0      
Credit Agreement and its Predecessor          
Short-term borrowing activity          
Maximum amount borrowed   217.0 200.0 215.0  
Average daily borrowings   $ 175.5 $ 134.2 $ 140.7  
Average interest rate during the year (as a percent)   1.77% 1.41% 1.69%  
Revolving credit facility | Credit Facility Amendment          
Financing Arrangements          
Increase in borrowing capacity   $ 250.0      
Total borrowing capacity   $ 750.0