SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Aerostructures Group [Member]	Sep. 30, 2011 Aerostructures Group [Member]	Sep. 30, 2012 Aerostructures Group [Member]	Sep. 30, 2011 Aerostructures Group [Member]	Sep. 30, 2012 Aerospace Systems	Sep. 30, 2011 Aerospace Systems	Sep. 30, 2012 Aerospace Systems	Sep. 30, 2011 Aerospace Systems	Sep. 30, 2012 Aftermarket Services	Sep. 30, 2011 Aftermarket Services	Sep. 30, 2012 Aftermarket Services	Sep. 30, 2011 Aftermarket Services	Sep. 30, 2012 Accounts receivables The Boeing Company ("Boeing")	Mar. 31, 2012 Accounts receivables The Boeing Company ("Boeing")	Sep. 30, 2012 Net sales	Sep. 30, 2011 Net sales	Sep. 30, 2012 Net sales The Boeing Company ("Boeing") Aerostructures Group [Member]	Sep. 30, 2011 Net sales The Boeing Company ("Boeing") Aerostructures Group [Member]	Sep. 30, 2012 Net sales The Boeing Company ("Boeing") Aerospace Systems	Sep. 30, 2011 Net sales The Boeing Company ("Boeing") Aerospace Systems	Sep. 30, 2012 Net sales The Boeing Company ("Boeing") Aftermarket Services	Sep. 30, 2011 Net sales The Boeing Company ("Boeing") Aftermarket Services
Concentration of Credit Risk
Concentration of Risk, Accounts Receivable, Major Customer																	41.20%	37.10%
Percentage from Boeing compared to total																			49.00%	46.00%
Net sales	$ 938,181	$ 790,528	$ 1,825,869	$ 1,635,591	$ 713,978	$ 587,977	$ 1,383,831	$ 1,231,283	$ 150,139	$ 133,775	$ 290,651	$ 266,785	$ 76,061	$ 70,547	$ 156,038	$ 140,915			$ 899,302	$ 745,957	$ 847,982	$ 702,331	$ 35,974	$ 31,002	$ 15,346	$ 12,624
Concentration Risk, Customer																			.1
Stock-Based Compensation
Share-based Compensation	$ 1,631	$ 1,199	$ 3,162	$ 2,397