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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2014
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Concentration of Credit Risk            
Revenues $ 855,108 $ 745,156   $ 1,688,008 $ 1,526,845  
Stock-Based Compensation            
Share-based Compensation 3,266 3,459   5,728 3,418  
Integrated Systems [Member]            
Concentration of Credit Risk            
Revenues 260,717 233,765   501,756 471,900  
Aerospace Structures [Member]            
Concentration of Credit Risk            
Revenues 528,367 447,772   1,060,753 931,088  
Product Support [Member]            
Concentration of Credit Risk            
Revenues $ 72,199 $ 68,366   $ 138,414 $ 134,799  
Accounts Receivable [Member] | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration Risk, Customer       .1    
Boeing [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration of Risk, Accounts Receivable, Major Customer 15.00%     15.00%   10.00%
Boeing [Member] | Net sales | Product Support [Member]            
Concentration of Credit Risk            
Revenues       $ 6,792    
Boeing [Member] | Net sales | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration Risk, Percentage       31.00% 33.00%  
Revenues     $ 507,330 $ 527,896    
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Integrated Systems [Member]            
Concentration of Credit Risk            
Revenues       110,971 $ 105,304  
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Aerospace Structures [Member]            
Concentration of Credit Risk            
Revenues       $ 410,133 397,817  
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Product Support [Member]            
Concentration of Credit Risk            
Revenues         4,209  
Gulfstream [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration of Risk, Accounts Receivable, Major Customer 7.00%     7.00%   16.00%
Gulfstream [Member] | Net sales | Product Support [Member]            
Concentration of Credit Risk            
Revenues       $ 303 $ 197  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration Risk, Percentage       10.00% 13.00%  
Revenues       $ 174,805 $ 198,525  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member] | Integrated Systems [Member]            
Concentration of Credit Risk            
Revenues       1,065 654  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member] | Aerospace Structures [Member]            
Concentration of Credit Risk            
Revenues       $ 173,437 $ 197,674  
Bombardier [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]            
Concentration of Credit Risk            
Concentration of Risk, Accounts Receivable, Major Customer 12.00%     12.00%   1.00%