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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Concentration of Credit Risk          
Revenues $ 704,666 $ 807,895 $ 2,207,007 $ 2,495,903  
Integrated Systems [Member]          
Concentration of Credit Risk          
Revenues 275,248 252,437 813,454 754,193  
Aerospace Structures [Member]          
Concentration of Credit Risk          
Revenues 368,972 490,337 1,210,729 1,551,090  
Product Support [Member]          
Concentration of Credit Risk          
Revenues $ 63,978 $ 71,446 $ 193,127 $ 209,860  
Accounts Receivable [Member]          
Concentration of Credit Risk          
Concentration Risk, Percentage     10.00%    
Revenue from Contract with Customer Benchmark [Member]          
Concentration of Credit Risk          
Concentration Risk, Percentage     10.00%    
Boeing [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]          
Concentration of Credit Risk          
Concentration of Risk, Accounts Receivable, Major Customer 15.00%   15.00%   18.00%
Boeing [Member] | Net sales | Product Support [Member]          
Concentration of Credit Risk          
Revenues     $ 17,416    
Boeing [Member] | Net sales | Credit Concentration Risk [Member]          
Concentration of Credit Risk          
Concentration Risk, Percentage     34.00% 31.00%  
Revenues     $ 742,495 $ 761,952  
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Integrated Systems [Member]          
Concentration of Credit Risk          
Revenues     172,438 167,870  
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Aerospace Structures [Member]          
Concentration of Credit Risk          
Revenues     $ 552,641 583,971  
Boeing [Member] | Net sales | Credit Concentration Risk [Member] | Product Support [Member]          
Concentration of Credit Risk          
Revenues       10,111  
Gulfstream [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]          
Concentration of Credit Risk          
Concentration of Risk, Accounts Receivable, Major Customer 4.00%   4.00%   11.00%
Gulfstream [Member] | Net sales | Product Support [Member]          
Concentration of Credit Risk          
Revenues     $ 838 $ 483  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member]          
Concentration of Credit Risk          
Concentration Risk, Percentage     12.00% 10.00%  
Revenues     $ 268,917 $ 261,880  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member] | Integrated Systems [Member]          
Concentration of Credit Risk          
Revenues     1,658 1,585  
Gulfstream [Member] | Net sales | Credit Concentration Risk [Member] | Aerospace Structures [Member]          
Concentration of Credit Risk          
Revenues     $ 266,421 $ 259,812  
Bombardier [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]          
Concentration of Credit Risk          
Concentration of Risk, Accounts Receivable, Major Customer 12.00%   12.00%   13.00%
Minimum [Member]          
Concentration of Credit Risk          
Standard Trade Receivable, Payment Terms     30 days    
Maximum [Member]          
Concentration of Credit Risk          
Standard Trade Receivable, Payment Terms     120 days