SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Consolidating Financial Statements, Captions
Revenues	$ 869,027	$ 807,895	$ 855,108	$ 832,900	$ 896,860	$ 775,246	$ 745,156	$ 781,689	$ 3,364,930	$ 3,198,951	$ 3,532,799
Operating income (loss)	$ (189,197)	$ (16,933)	$ (2,001)	$ (66,548)	(310,437)	(154,206)	$ (29)	$ (968)	(274,679)	(465,640)	(31,196)
Intercompany interest and charges									0	0	0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									(62,105)	(103,234)	(88,085)
Interest Expense and Other									114,619	99,442	80,501
(Loss) income from continuing operations before income taxes									(327,193)	(461,848)	(23,612)
Income tax (benefit) expense									(5,426)	(36,457)	19,340
Net income									(321,767)	(425,391)	(42,952)
Other Comprehensive Income (Loss), Net of Tax									(119,814)	28,308	(49,016)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(441,581)	(397,083)	(91,968)
Operating costs and expenses:
Cost of sales									2,924,920	2,607,556	2,774,449
Selling, general and administrative									298,386	292,630	285,001
Depreciation and amortization									149,904	158,368	176,946
Business Combination, Integration Related Costs												$ 19,124
Asset Impairment Charges					$ 345,000	$ 190,227			0	535,227	266,298
Restructuring Charges									31,098	40,069	42,177
Gain (Loss) on Disposition of Business									235,301	30,741	19,124
Total operating costs and expenses									3,639,609	3,664,591	3,563,995
Consolidation, Eliminations [Member]
Consolidating Financial Statements, Captions
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									0	0	0
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Revenues									368,139	360,286	379,960
Operating income (loss)									30,311	(50,562)	25,080
Intercompany interest and charges									8,199	8,266	8,875
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									(1,935)	(2,522)	(1,482)
Interest Expense and Other									(5,573)	2,045	(6,671)
(Loss) income from continuing operations before income taxes									29,620	(58,351)	24,358
Income tax (benefit) expense									3,714	15,296	4,573
Net income									25,906	(73,647)	19,785
Other Comprehensive Income (Loss), Net of Tax									10,077	28,529	(28,396)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									35,983	(45,118)	(8,611)
Operating costs and expenses:
Cost of sales									287,597	291,438	305,327
Selling, general and administrative									32,902	31,694	31,920
Depreciation and amortization									17,370	16,829	16,728
Business Combination, Integration Related Costs												0
Asset Impairment Charges										65,510	0
Restructuring Charges									0	5,377	905
Gain (Loss) on Disposition of Business									(41)	0
Total operating costs and expenses									337,828	410,848	354,880
Parent
Consolidating Financial Statements, Captions
Revenues									0	0	0
Operating income (loss)									(323,216)	(154,594)	(109,603)
Intercompany interest and charges									(154,100)	(159,038)	(183,115)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									264	(25,722)	0
Interest Expense and Other									102,338	86,181	75,483
(Loss) income from continuing operations before income taxes									(271,718)	(56,015)	(1,971)
Income tax (benefit) expense									(220)	(17,619)	23,729
Net income									(271,498)	(38,396)	(25,700)
Other Comprehensive Income (Loss), Net of Tax									(1,252)	(2,031)	5,073
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(272,750)	(40,427)	(20,627)
Operating costs and expenses:
Cost of sales									0	0	0
Selling, general and administrative									78,921	102,733	66,822
Depreciation and amortization									3,099	1,851	1,461
Business Combination, Integration Related Costs												19,124
Asset Impairment Charges										0	0
Restructuring Charges									6,233	19,269	22,196
Gain (Loss) on Disposition of Business									234,963	30,741
Total operating costs and expenses									323,216	154,594	109,603
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Revenues									3,076,976	2,918,508	3,229,136
Operating income (loss)									18,226	(260,484)	53,327
Intercompany interest and charges									145,901	150,772	174,240
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									(60,434)	(74,990)	(86,603)
Interest Expense and Other									17,854	11,216	11,689
(Loss) income from continuing operations before income taxes									(85,095)	(347,482)	(45,999)
Income tax (benefit) expense									(8,920)	(34,134)	(8,962)
Net income									(76,175)	(313,348)	(37,037)
Other Comprehensive Income (Loss), Net of Tax									(128,639)	1,810	(25,693)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(204,814)	(311,538)	(62,730)
Operating costs and expenses:
Cost of sales									2,717,508	2,395,961	2,545,419
Selling, general and administrative									186,563	158,203	186,259
Depreciation and amortization									129,435	139,688	158,757
Business Combination, Integration Related Costs												0
Asset Impairment Charges										469,717	266,298
Restructuring Charges									24,865	15,423	19,076
Gain (Loss) on Disposition of Business									379	0
Total operating costs and expenses									3,058,750	3,178,992	3,175,809
Restructuring (SG&A) [Member]
Operating costs and expenses:
Restructuring Charges									31,098
Gain (Loss) on Disposition of Business									235,301
Restructuring Charges [Member]
Operating costs and expenses:
Restructuring Charges										40,069
Consolidation, Eliminations [Member]
Consolidating Financial Statements, Captions
Revenues									(80,185)	(79,843)	(76,297)
Operating income (loss)									0	0	0
Intercompany interest and charges									0	0	0
Interest Expense and Other									0	0	0
(Loss) income from continuing operations before income taxes									0	0	0
Income tax (benefit) expense									0	0	0
Net income									0	0	0
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									0	0	0
Operating costs and expenses:
Cost of sales									(80,185)	(79,843)	(76,297)
Selling, general and administrative									0	0	0
Depreciation and amortization									0	0	0
Business Combination, Integration Related Costs												$ 0
Asset Impairment Charges										0	0
Restructuring Charges									0	0	0
Gain (Loss) on Disposition of Business									0	0
Total operating costs and expenses									$ (80,185)	$ (79,843)	$ (76,297)