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GOODWILL (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended	12 Months Ended
GOODWILL (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2015
Goodwill
Asset Impairment Charges	$ 345,000	$ 190,227		$ (597,603)		$ 535,227	$ 266,298	$ 874,361
Changes in the carrying value of goodwill
Balance at the beginning of the period			$ 1,444,254			1,142,605	1,444,254
Goodwill recognized in connection with acquisitions							(1,834)
Goodwill, Written off Related to Sale of Business Unit						(27,709)	(19,265)
Effect of exchange rate changes and other						13,159	(14,252)
Balance at the end of the period	592,828			1,444,254		592,828	1,142,605	1,444,254
Aerospace Structures [Member]
Goodwill
Asset Impairment Charges						535,227	266,298	873,961
Changes in the carrying value of goodwill
Balance at the beginning of the period			802,102			532,418	802,102
Goodwill recognized in connection with acquisitions							0
Goodwill, Written off Related to Sale of Business Unit						0	0
Effect of exchange rate changes and other						2,809	(3,386)
Balance at the end of the period	0			802,102		0	532,418	802,102
Product Support [Member]
Changes in the carrying value of goodwill
Balance at the beginning of the period			81,456			69,032	81,456
Goodwill recognized in connection with acquisitions							0
Goodwill, Written off Related to Sale of Business Unit						0	12,665
Effect of exchange rate changes and other						(97)	241
Balance at the end of the period	68,935			81,456		68,935	69,032	81,456
Integrated Systems [Member]
Goodwill
Asset Impairment Charges						0	0	400
Changes in the carrying value of goodwill
Balance at the beginning of the period			$ 560,696			541,155	560,696
Goodwill recognized in connection with acquisitions							1,834
Goodwill, Written off Related to Sale of Business Unit						(27,709)	(6,600)
Effect of exchange rate changes and other						10,447	(11,107)
Balance at the end of the period	523,893			560,696		523,893	541,155	560,696
Goodwill [Member]
Goodwill
Asset Impairment Charges						(535,227)	(266,298)
Goodwill [Member] \| Aerospace Structures [Member]
Goodwill
Goodwill, Impaired, Accumulated Impairment Loss	1,399,128					1,399,128
Asset Impairment Charges						(535,227)	(266,298)
Goodwill [Member] \| Product Support [Member]
Goodwill
Asset Impairment Charges						0	0
Goodwill [Member] \| Integrated Systems [Member]
Goodwill
Asset Impairment Charges						0	0
Trade Names [Member]
Goodwill
Finite-Lived Intangible Assets, Net	127,126					127,126	153,492
Indefinite-Lived Intangible Assets (Excluding Goodwill)				163,000	$ 209,200			$ 163,000
Asset Impairment Charges	46,200			$ 46,200
Finite-Lived Intangible Assets, Gross	$ 150,000					$ 150,000	$ 163,000
Changes in the carrying value of goodwill
Finite-Lived Intangible Asset, Useful Life			10 years 4 months			10 years	20 years
Trade Names [Member] \| Aerospace Structures [Member]
Goodwill
Finite-Lived Intangible Assets, Net					195,800
Indefinite-Lived Intangible Assets (Excluding Goodwill)									$ 425,000
Asset Impairment Charges					$ 229,200
Royalty Rate - High End [Member]
Goodwill
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Other Key Assumption Rate or Value	0.04	0.04
Royalty Rate - Low End [Member]
Goodwill
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Other Key Assumption Rate or Value	0.02	0.02
Discount Rate - Low End [Member]
Goodwill
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Other Key Assumption Rate or Value		0.12
Discount Rate - High End [Member]
Goodwill
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Other Key Assumption Rate or Value	0.14	0.13