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DEBT Narrative (Details)
$ / shares in Units, £ in Millions
1 Months Ended 12 Months Ended
Apr. 17, 2018
USD ($)
subsidiary
Dec. 18, 2017
USD ($)
Feb. 01, 2017
USD ($)
Oct. 12, 2012
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
aircraft
Days
tranche
Months
Loan
$ / shares
Mar. 31, 2018
GBP (£)
Days
Months
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 13, 2017
Debt Instrument [Line Items]                    
Proceeds from borrowings           $ 896,874,000   $ 708,267,000 $ 928,802,000  
Debt balance, gross           1,513,999,000   1,293,364,000    
Payments of Debt Issuance Costs           20,560,000   8,010,000 5,139,000  
Derivative, Cost of Hedge Net of Cash Received           (10,100,000)        
Purchase of 4½% Convertible Senior Notes call option           40,393,000   0 0  
Proceeds from issuance of warrants           $ 30,259,000   0 0  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares           $ 20.02        
Strike Price, Percentage Difference from Specific Date                   60.00%
Lessor, Operating Lease, Term of Contract           181 months 181 months      
Unamortized discount           $ 36,400,000        
Unamortized debt issuance costs           27,465,000   11,345,000    
Interest paid           78,100,000   51,400,000 41,800,000  
Capitalized interest cost           3,400,000   10,200,000 $ 10,600,000  
Cash collateral for letters of credit           19,800,000        
Senior Notes | 8.75% Senior Secured Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 350,000,000        
Debt Instrument, Interest Rate, Stated Percentage           8.75%        
Proceeds from borrowings           $ 346,600,000        
Debt balance, gross           $ 346,610,000   0    
Number Of Aircraft Pledged As Collateral | aircraft           77        
Mandatory Redemption, Terms, Amount           $ 125,000,000        
Debt Instrument Terms, Event Of Default, Percentage Of Holders To Declare Payment           25.00%        
Debt Instrument, Debt Repurchase Terms, Percentage Of Principal Amount If Change Of Control           101.00%        
Unamortized discount           $ 3,400,000        
Senior Notes | 8.75% Senior Secured Notes | Debt Instrument, Redemption, Period One                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage           100.00% 100.00%      
Senior Notes | 8.75% Senior Secured Notes | Debt Instrument, Redemption, Period Two                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage           108.75% 108.75%      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed           35.00% 35.00%      
Senior Notes | 6¼% Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 450,000,000        
Debt balance, gross           401,535,000   401,535,000    
Payments of Debt Issuance Costs       $ 7,400,000            
Convertible debt | 4½% Convertible Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 143,750,000        
Debt Instrument, Interest Rate, Stated Percentage           4.50%        
Debt balance, gross           $ 107,397,000   0    
Debt Instrument, Interest Rate, Effective Percentage           11.00%        
Debt Instrument, Convertible, Conversion Price | $ / shares           $ 15.64        
Debt Instrument, Convertible, Conversion Ratio           63.9488 63.9488      
Debt Instrument, Convertible, Conversion Per Principal Amount           $ 1,000        
Unamortized discount           36,353,000        
Term Loan                    
Debt Instrument [Line Items]                    
Repayments of Debt   $ 89,600,000                
Term Loan | Term Loan                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           350,000,000        
Repayments of Debt     $ 45,900,000   $ 93,700,000 261,900,000        
Debt balance, gross           0   261,907,000    
Term Loan Credit Facility | Term Loan Credit Facility                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           200,000,000        
Repayments of Debt     $ 154,100,000   17,000,000          
Debt balance, gross           0   45,900,000    
Revolving Credit Facility | ABL Facility | Subsequent Event                    
Debt Instrument [Line Items]                    
Line Of Credit Facility, Number Of Borrowers | subsidiary 2                  
Line of Credit Facility, Current Borrowing Capacity $ 75,000,000                  
Line Of Credit Facility, Availability Block Capacity 15,000,000                  
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000                  
Debt Instrument, Term 5 years                  
Revolving Credit Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           400,000,000        
Proceeds from borrowings           174,800,000        
Repayments of Debt         $ 103,000,000 313,900,000        
Debt balance, gross           0   139,100,000    
Secured Debt | Lombard Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           200,000,000        
Debt balance, gross           $ 211,087,000   $ 196,832,000    
Debt Instrument, Basis Spread on Variable Rate           2.25% 2.25%      
Debt Instrument, Interest Rate, Effective Percentage           2.96%   2.57%    
Debt Instrument, Term           7 years 7 years      
Number Of Debt Borrowings | Loan           2        
Secured Debt | Lombard Debt | Tranche One [Member]                    
Debt Instrument [Line Items]                    
Proceeds from borrowings           $ 109,900,000 £ 89.1      
Repayments of Debt           $ 4,500,000 3.7      
Number Of Aircraft Financed | aircraft           3        
Secured Debt | Lombard Debt | Tranche Two [Member]                    
Debt Instrument [Line Items]                    
Proceeds from borrowings           $ 90,100,000 £ 72.4      
Number Of Aircraft Financed | aircraft           5        
Secured Debt | Macquarie Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 200,000,000        
Debt balance, gross           $ 185,028,000   $ 200,000,000    
Debt Instrument, Basis Spread on Variable Rate           5.35% 5.35%      
Debt Instrument, Interest Rate, Effective Percentage           7.00%   6.24%    
Debt Instrument, Term           5 years 5 years      
Number Of Aircraft Pledged As Collateral | aircraft           20        
Number Of Leased Aircraft | aircraft           5        
Secured Debt | Macquarie Debt | Minimum                    
Debt Instrument [Line Items]                    
Lessor, Operating Lease, Term of Contract           60 months 60 months      
Secured Debt | Macquarie Debt | Maximum                    
Debt Instrument [Line Items]                    
Lessor, Operating Lease, Term of Contract           63 months 63 months      
Secured Debt | PK Air Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 230,000,000        
Debt balance, gross           $ 230,000,000   $ 0    
Debt Instrument, Interest Rate, Effective Percentage           6.79%        
Debt Instrument, Term           70 months 70 months      
Number Of Tranches | tranche           2        
Debt Instrument, Number of Loans | Loan           24        
Debt Instrument, Payment Start Date, Number Of Months Following Borrowing Date           7 months 7 months      
Debt Instrument, Periodic Payment Terms, Balloon Payments To Be Paid, Percentage Of Face Amount           53.00%        
Secured Debt | PK Air Debt | One-Month LIBOR                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           5.00% 5.00%      
Variable In Determining Interest Rate, Number of Days | Days           2 2      
Debt Instrument, Fix Rate Basis, Number Of 30-Day Months Of A Notional Interest Rate Swap | Months           12 12      
Other Debt | Airnorth Debt                    
Debt Instrument [Line Items]                    
Debt balance, gross           $ 13,832,000   16,471,000    
Other Debt | Airnorth Debt | Minimum                    
Debt Instrument [Line Items]                    
Debt Instrument, Remaining Term           2 years 2 years      
Other Debt | Airnorth Debt | Maximum                    
Debt Instrument [Line Items]                    
Debt Instrument, Remaining Term           6 years 6 years      
Other Debt | Eastern Airways Debt                    
Debt Instrument [Line Items]                    
Debt balance, gross           $ 14,519,000   15,326,000    
Debt Instrument, Basis Spread on Variable Rate           1.75% 1.75%      
Debt Instrument, Interest Rate, Effective Percentage           2.225%        
Other Debt | Other Debt                    
Debt Instrument [Line Items]                    
Repayments of Debt           $ 16,000,000        
Debt balance, gross           3,991,000   $ 16,293,000    
Letters of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           $ 50,000,000        
Term Loan, one of three loans | Airnorth Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           2.85% 2.85%      
Term Loan, two of three loans | Airnorth Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage           3.10%        
Debt Instrument, Basis Spread on Variable Rate           2.00% 2.00%      
Number Of Debt Borrowings | Loan           2