SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Consolidating Financial Statements, Captions
Net sales	$ 954,774	$ 994,123	$ 1,914,412	$ 1,891,028
Current assets:
Property and equipment, net	914,304		914,304		$ 950,734
Goodwill and other intangible assets, net	2,956,928		2,956,928		2,985,590
Other, net	109,928		109,928		107,997
Intercompany investments and advances	0		0		0
Total assets	6,272,571		6,272,571		6,096,054
Current liabilities:
Long-term debt, less current portion	1,556,647		1,556,647		1,326,345
Intercompany debt	0		0		0
Accrued pension and other postretirement benefits, noncurrent	492,433		492,433		538,381
Deferred income taxes and other	1,118,861		1,118,861		1,212,307
Total stockholders' equity	2,257,382		2,257,382		2,135,784
Total liabilities and stockholders' equity	6,272,571		6,272,571		6,096,054
Cost of Goods and Services Sold	730,831	771,445	1,462,925	1,456,262
Selling, General and Administrative Expense	71,321	68,770	144,602	134,479
Depreciation and amortization	42,575	39,014	86,109	76,565
Restructuring Charges	0	196	0	3,193
Gain (Loss) Related to Litigation Settlement	0	0	0	(134,693)
Total operating costs and expenses	844,727	879,425	1,696,499	1,535,806
Operating Income (Loss)	110,047	114,698	217,913	355,222
Intercompany Interest and Charges	0	0	0	0
Interest expense and other	15,631	15,386	33,747	57,746
Income from continuing operations before income taxes	94,416	99,312	184,166	297,476
Income Tax Expense (Benefit)	32,804	31,866	59,823	101,786
Net Income (Loss) Attributable to Parent	61,612	67,446	124,343	195,690
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(18,555)	(17,485)	233	(13,206)
Total comprehensive income	43,057	49,961	124,576	182,484
Parent
Consolidating Financial Statements, Captions
Net sales	0	0	0	0
Current assets:
Property and equipment, net	7,573		7,573		8,209
Goodwill and other intangible assets, net	0		0		0
Other, net	12,903		12,903		13,805
Intercompany investments and advances	4,029,045		4,029,045		4,062,058
Total assets	4,057,672		4,057,672		4,094,779
Current liabilities:
Long-term debt, less current portion	1,308,097		1,308,097		1,155,299
Intercompany debt	402,762		402,762		719,525
Accrued pension and other postretirement benefits, noncurrent	7,633		7,633		7,517
Deferred income taxes and other	11,617		11,617		10,435
Total stockholders' equity	2,257,381		2,257,381		2,135,785
Total liabilities and stockholders' equity	4,057,672		4,057,672		4,094,779
Cost of Goods and Services Sold	0	0	0	0
Selling, General and Administrative Expense	11,908	12,493	25,060	22,663
Depreciation and amortization	389	626	789	1,264
Restructuring Charges		0		0
Gain (Loss) Related to Litigation Settlement				(134,693)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			(2,863)
Total operating costs and expenses	12,297	13,119	28,712	(110,766)
Operating Income (Loss)	(12,297)	(13,119)	(28,712)	110,766
Intercompany Interest and Charges	(50,709)	(52,345)	(104,300)	(105,634)
Interest expense and other	15,133	15,014	29,648	56,298
Income from continuing operations before income taxes	23,279	24,212	45,940	160,102
Income Tax Expense (Benefit)	5,487	5,553	5,476	51,737
Net Income (Loss) Attributable to Parent	17,792	18,659	40,464	108,365
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,800)	1,456	(781)	(84)
Total comprehensive income	15,992	20,115	39,683	108,281
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Net sales	876,282	909,720	1,761,725	1,752,016
Current assets:
Property and equipment, net	776,184		776,184		807,070
Goodwill and other intangible assets, net	2,754,973		2,754,973		2,780,855
Other, net	79,806		79,806		80,806
Intercompany investments and advances	81,541		81,541		81,540
Total assets	5,499,689		5,499,689		5,323,654
Current liabilities:
Long-term debt, less current portion	69,850		69,850		71,046
Intercompany debt	2,021,140		2,021,140		1,769,564
Accrued pension and other postretirement benefits, noncurrent	482,895		482,895		527,741
Deferred income taxes and other	1,047,351		1,047,351		1,138,648
Total stockholders' equity	1,185,592		1,185,592		1,084,587
Total liabilities and stockholders' equity	5,499,689		5,499,689		5,323,654
Cost of Goods and Services Sold	667,591	705,399	1,339,900	1,343,290
Selling, General and Administrative Expense	49,803	47,264	102,241	95,647
Depreciation and amortization	37,766	34,512	72,808	68,573
Restructuring Charges		196		3,193
Gain (Loss) Related to Litigation Settlement				0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	755,160	787,371	1,514,949	1,510,703
Operating Income (Loss)	121,122	122,349	246,776	241,313
Intercompany Interest and Charges	48,401	50,142	99,913	101,672
Interest expense and other	2,193	2,388	5,083	4,543
Income from continuing operations before income taxes	70,528	69,819	141,780	135,098
Income Tax Expense (Benefit)	26,196	26,295	52,590	51,370
Net Income (Loss) Attributable to Parent	44,332	43,524	89,190	83,728
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,097)	(1,533)	5,739	(3,066)
Total comprehensive income	43,235	41,991	94,929	80,662
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Net sales	95,355	90,664	181,492	147,255
Current assets:
Property and equipment, net	130,547		130,547		135,455
Goodwill and other intangible assets, net	201,955		201,955		204,735
Other, net	17,219		17,219		13,386
Intercompany investments and advances	78,195		78,195		63,897
Total assets	903,991		903,991		885,116
Current liabilities:
Long-term debt, less current portion	178,700		178,700		100,000
Intercompany debt	341,450		341,450		407,722
Accrued pension and other postretirement benefits, noncurrent	1,905		1,905		3,123
Deferred income taxes and other	59,893		59,893		63,224
Total stockholders' equity	237,838		237,838		226,096
Total liabilities and stockholders' equity	903,991		903,991		885,116
Cost of Goods and Services Sold	80,103	72,307	151,830	121,215
Selling, General and Administrative Expense	9,610	9,013	17,301	16,169
Depreciation and amortization	4,420	3,876	12,512	6,728
Restructuring Charges		0		0
Gain (Loss) Related to Litigation Settlement				0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	94,133	85,196	181,643	144,112
Operating Income (Loss)	1,222	5,468	(151)	3,143
Intercompany Interest and Charges	2,308	2,203	4,387	3,962
Interest expense and other	(1,695)	(2,016)	(984)	(3,095)
Income from continuing operations before income taxes	609	5,281	(3,554)	2,276
Income Tax Expense (Benefit)	1,121	18	1,757	(1,321)
Net Income (Loss) Attributable to Parent	(512)	5,263	(5,311)	3,597
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(15,658)	(17,408)	(4,725)	(10,056)
Total comprehensive income	(16,170)	(12,145)	(10,036)	(6,459)
Eliminations
Consolidating Financial Statements, Captions
Net sales	(16,863)	(6,261)	(28,805)	(8,243)
Current assets:
Property and equipment, net	0		0		0
Goodwill and other intangible assets, net	0		0		0
Other, net	0		0		0
Intercompany investments and advances	(4,188,781)		(4,188,781)		(4,207,495)
Total assets	(4,188,781)		(4,188,781)		(4,207,495)
Current liabilities:
Long-term debt, less current portion	0		0		0
Intercompany debt	(2,765,352)		(2,765,352)		(2,896,811)
Accrued pension and other postretirement benefits, noncurrent	0		0		0
Deferred income taxes and other	0		0		0
Total stockholders' equity	(1,423,429)		(1,423,429)		(1,310,684)
Total liabilities and stockholders' equity	(4,188,781)		(4,188,781)		$ (4,207,495)
Cost of Goods and Services Sold	(16,863)	(6,261)	(28,805)	(8,243)
Selling, General and Administrative Expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Restructuring Charges		0		0
Gain (Loss) Related to Litigation Settlement				0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	(16,863)	(6,261)	(28,805)	(8,243)
Operating Income (Loss)	0	0	0	0
Intercompany Interest and Charges	0	0	0	0
Interest expense and other	0	0	0	0
Income from continuing operations before income taxes	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Net Income (Loss) Attributable to Parent	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	0	0	0
Total comprehensive income	$ 0	$ 0	$ 0	$ 0