SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Consolidating Financial Statements, Captions
Current portion of long-term debt	$ 42,759		$ 42,759		$ 42,255
Trade and other receivables, net	484,796		484,796		521,601
Inventories	1,661,273		1,661,273		1,280,274
Accounts payable	359,999		359,999		429,134
Rotable assets	52,478		52,478		48,820
Net sales	913,866	$ 917,417	2,828,278	$ 2,808,444
Operating costs and expenses:
Adjustments to reconcile net income to net cash (used in) provided by operating activities			(210,414)	154,106
Net cash (used in) provided by operating activities			(174,719)	309,964
Net increase in revolving credit facility			245,448	17,607
Proceeds on issuance of debt			131,897	394,512
Retirements and repayments of debt			(67,455)	(541,884)
Payments for Repurchase of Common Stock			0	114,634
Payment of deferred financing costs			(171)	(5,859)
Dividends paid			(5,916)	(6,122)
Repayments of government grant			(5,000)	(3,198)
Repurchase of restricted shares for minimum tax obligation			(96)	(673)
Proceeds from exercise of stock options, including excess tax benefit			0	388
Intercompany financing and advances			0	0
Net cash (used in) provided by financing activities			298,707	(259,863)
Effect of exchange rate changes on cash and cash equivalents			567	(250)
Net change in cash and cash equivalents			9,073	5,183
Cash at beginning of period			32,617	28,998
Cash at end of period	41,690	34,181	41,690	34,181
Cost of Goods and Services Sold	691,812	867,970	2,154,737	2,324,231
Selling, General and Administrative Expense	65,676	70,905	210,278	205,384
Depreciation and amortization	41,028	39,808	127,137	116,373
Asset Impairment Charges	229,200	0	229,200	0
Gain (Loss) Related to Litigation Settlement	(12,400)	0	12,400	134,693
Total operating costs and expenses	1,040,116	978,683	2,736,615	2,514,488
Income Tax Expense (Benefit)	(53,393)	(35,007)	6,429	66,778
Accrued expenses	411,444		411,444		411,848
Prepaid and other current assets	32,800		32,800		23,069
Total current assets	2,273,037		2,273,037		1,906,381
Property and equipment, net	915,021		915,021		950,734
Goodwill and other intangible assets, net	2,752,298		2,752,298		2,991,211
Other, net	108,500		108,500		107,999
Intercompany investments and advances	0		0		0
Total assets	6,048,856		6,048,856		5,956,325
Current liabilities:
Total current liabilities	814,202		814,202		883,237
Long-term debt, less current portion	1,638,195		1,638,195		1,326,345
Intercompany debt	0		0		0
Accrued pension and other postretirement benefits, noncurrent	460,870		460,870		538,381
Deferred income taxes and other	968,174		968,174		1,072,578
Total stockholders' equity	2,167,415		2,167,415		2,135,784
Total liabilities and stockholders’ equity	6,048,856		6,048,856		5,956,325
Operating Income (Loss)	(126,250)	(61,266)	91,663	293,956
Intercompany Interest and Charges	0	0	0	0
Interest expense and other	15,792	13,573	49,539	71,320
Income from continuing operations before income taxes	(142,042)	(74,839)	42,124	222,636
Net Income (Loss) Attributable to Parent	(88,649)	(39,832)	35,695	155,858
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(475)	(19,616)	(242)	(32,822)
Total comprehensive income	(89,124)	(59,448)	35,453	123,036
Capital expenditures	25,235	26,096	63,363	85,170
Reimbursement Revenue		(553)	0	(553)
Proceeds from sale of assets			1,836	1,867
Payments to Acquire Businesses, Net of Cash Acquired			53,955	(38,082)
Net cash used in investing activities			(115,482)	(44,668)
Parent
Consolidating Financial Statements, Captions
Current portion of long-term debt	26,067		26,067		19,024
Trade and other receivables, net	2,881		2,881		3,578
Inventories	0		0		0
Accounts payable	1,792		1,792		8,919
Rotable assets	0		0		0
Net sales	0	0	0	0
Operating costs and expenses:
Adjustments to reconcile net income to net cash (used in) provided by operating activities			(7,870)	(229,295)
Net cash (used in) provided by operating activities			(56,890)	(98,428)
Net increase in revolving credit facility			245,448	17,607
Proceeds on issuance of debt			0	300,000
Retirements and repayments of debt			(14,267)	(396,477)
Payment of deferred financing costs			(171)	(5,859)
Dividends paid			(5,916)	(6,122)
Repayments of government grant			0	0
Repurchase of restricted shares for minimum tax obligation			(96)	(673)
Proceeds from exercise of stock options, including excess tax benefit				388
Intercompany financing and advances			(281,360)	302,853
Net cash (used in) provided by financing activities			(56,362)	97,083
Effect of exchange rate changes on cash and cash equivalents			0	0
Net change in cash and cash equivalents			(6)	(2,199)
Cash at beginning of period			620	2,820
Cash at end of period	614	621	614	621
Cost of Goods and Services Sold	0	0	0	0
Selling, General and Administrative Expense	3,698	10,740	28,755	33,405
Depreciation and amortization	435	606	1,224	1,870
Asset Impairment Charges	0
Gain (Loss) Related to Litigation Settlement	0		0	134,693
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			2,863
Total operating costs and expenses	4,133	11,346	32,842	(99,418)
Income Tax Expense (Benefit)	6,164	1,966	11,639	53,702
Accrued expenses	29,519		29,519		38,275
Prepaid and other current assets	7,890		7,890		6,509
Total current assets	11,385		11,385		10,707
Property and equipment, net	7,292		7,292		8,209
Goodwill and other intangible assets, net	0		0		0
Other, net	12,405		12,405		13,805
Intercompany investments and advances	4,039,718		4,039,718		4,062,058
Total assets	4,070,800		4,070,800		4,094,779
Current liabilities:
Total current liabilities	57,378		57,378		66,218
Long-term debt, less current portion	1,380,805		1,380,805		1,155,299
Intercompany debt	449,831		449,831		719,525
Accrued pension and other postretirement benefits, noncurrent	7,228		7,228		7,517
Deferred income taxes and other	8,143		8,143		10,435
Total stockholders' equity	2,167,415		2,167,415		2,135,785
Total liabilities and stockholders’ equity	4,070,800		4,070,800		4,094,779
Operating Income (Loss)	(4,133)	(11,346)	(32,842)	99,418
Intercompany Interest and Charges	(50,274)	(51,017)	(154,574)	(156,650)
Interest expense and other	15,685	15,200	45,333	71,499
Income from continuing operations before income taxes	30,456	24,471	76,399	184,569
Net Income (Loss) Attributable to Parent	24,292	22,505	64,760	130,867
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,161	(1,311)	1,380	(1,395)
Total comprehensive income	26,453	21,194	66,140	129,472
Capital expenditures			534	854
Reimbursement Revenue		0
Proceeds from sale of assets			0	0
Payments to Acquire Businesses, Net of Cash Acquired			0	0
Net cash used in investing activities			(534)	(854)
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Current portion of long-term debt	16,692		16,692		23,231
Trade and other receivables, net	172,787		172,787		180,874
Inventories	1,556,769		1,556,769		1,200,941
Accounts payable	312,560		312,560		382,143
Rotable assets	35,946		35,946		35,248
Net sales	837,156	838,709	2,598,880	2,590,724
Operating costs and expenses:
Adjustments to reconcile net income to net cash (used in) provided by operating activities			(216,641)	338,153
Net cash (used in) provided by operating activities			239,483	360,543
Net increase in revolving credit facility			0	0
Proceeds on issuance of debt			6,497	28,912
Retirements and repayments of debt			(18,788)	(15,507)
Payment of deferred financing costs			0	0
Dividends paid			0	0
Repayments of government grant			(5,000)	(3,198)
Repurchase of restricted shares for minimum tax obligation			0	0
Proceeds from exercise of stock options, including excess tax benefit				0
Intercompany financing and advances			351,173	(418,857)
Net cash (used in) provided by financing activities			333,882	(408,650)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net change in cash and cash equivalents			725	265
Cash at beginning of period			419	1,149
Cash at end of period	1,144	1,414	1,144	1,414
Cost of Goods and Services Sold	629,460	798,245	1,969,359	2,141,533
Selling, General and Administrative Expense	52,368	51,240	154,611	146,886
Depreciation and amortization	36,050	34,971	108,858	103,545
Asset Impairment Charges	229,200
Gain (Loss) Related to Litigation Settlement	(12,400)		(12,400)	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	959,478	884,456	2,474,428	2,395,157
Income Tax Expense (Benefit)	(60,820)	(35,311)	(8,229)	16,059
Accrued expenses	343,478		343,478		326,694
Prepaid and other current assets	16,679		16,679		10,549
Total current assets	1,783,325		1,783,325		1,428,031
Property and equipment, net	774,831		774,831		807,070
Goodwill and other intangible assets, net	2,556,202		2,556,202		2,786,400
Other, net	71,616		71,616		80,806
Intercompany investments and advances	82,369		82,369		81,540
Total assets	5,268,343		5,268,343		5,183,847
Current liabilities:
Total current liabilities	672,730		672,730		732,068
Long-term debt, less current portion	66,390		66,390		71,046
Intercompany debt	2,170,282		2,170,282		1,769,564
Accrued pension and other postretirement benefits, noncurrent	452,250		452,250		527,741
Deferred income taxes and other	903,960		903,960		998,841
Total stockholders' equity	1,002,731		1,002,731		1,084,587
Total liabilities and stockholders’ equity	5,268,343		5,268,343		5,183,847
Operating Income (Loss)	(122,322)	(45,747)	124,452	195,567
Intercompany Interest and Charges	47,997	48,546	147,910	150,218
Interest expense and other	2,529	2,356	7,613	6,900
Income from continuing operations before income taxes	(172,848)	(96,649)	(31,071)	38,449
Net Income (Loss) Attributable to Parent	(112,028)	(61,338)	(22,842)	22,390
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6,510	(1,974)	12,249	(5,473)
Total comprehensive income	(105,518)	(63,312)	(10,593)	16,917
Capital expenditures			47,377	70,014
Reimbursement Revenue		(553)
Proceeds from sale of assets			1,658	1,789
Payments to Acquire Businesses, Net of Cash Acquired			(47,955)	(116,044)
Net cash used in investing activities			(93,674)	48,372
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Current portion of long-term debt	0		0		0
Trade and other receivables, net	309,128		309,128		337,149
Inventories	104,504		104,504		79,333
Accounts payable	45,647		45,647		38,072
Rotable assets	16,532		16,532		13,572
Net sales	92,462	86,585	273,954	233,839
Operating costs and expenses:
Adjustments to reconcile net income to net cash (used in) provided by operating activities			8,375	32,114
Net cash (used in) provided by operating activities			2,152	34,715
Net increase in revolving credit facility			0	0
Proceeds on issuance of debt			125,400	65,600
Retirements and repayments of debt			(34,400)	(129,900)
Payment of deferred financing costs			0	0
Dividends paid			0	0
Repayments of government grant			0	0
Repurchase of restricted shares for minimum tax obligation			0	0
Proceeds from exercise of stock options, including excess tax benefit				0
Intercompany financing and advances			(64,091)	129,138
Net cash (used in) provided by financing activities			26,909	64,838
Effect of exchange rate changes on cash and cash equivalents			567	(250)
Net change in cash and cash equivalents			8,354	7,117
Cash at beginning of period			31,578	25,029
Cash at end of period	39,932	32,146	39,932	32,146
Cost of Goods and Services Sold	78,104	77,602	229,934	198,817
Selling, General and Administrative Expense	9,610	8,925	26,912	25,093
Depreciation and amortization	4,543	4,231	17,055	10,958
Asset Impairment Charges	0
Gain (Loss) Related to Litigation Settlement	0		0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	92,257	90,758	273,901	234,868
Income Tax Expense (Benefit)	1,263	(1,662)	3,019	(2,983)
Accrued expenses	38,447		38,447		46,879
Prepaid and other current assets	8,231		8,231		6,011
Total current assets	478,327		478,327		467,643
Property and equipment, net	132,898		132,898		135,455
Goodwill and other intangible assets, net	196,096		196,096		204,811
Other, net	24,479		24,479		13,388
Intercompany investments and advances	75,169		75,169		63,897
Total assets	906,969		906,969		885,194
Current liabilities:
Total current liabilities	84,094		84,094		84,951
Long-term debt, less current portion	191,000		191,000		100,000
Intercompany debt	346,454		346,454		407,722
Accrued pension and other postretirement benefits, noncurrent	1,392		1,392		3,123
Deferred income taxes and other	56,071		56,071		63,302
Total stockholders' equity	227,958		227,958		226,096
Total liabilities and stockholders’ equity	906,969		906,969		885,194
Operating Income (Loss)	205	(4,173)	53	(1,029)
Intercompany Interest and Charges	2,277	2,471	6,664	6,432
Interest expense and other	(2,422)	(3,983)	(3,407)	(7,079)
Income from continuing operations before income taxes	350	(2,661)	(3,204)	(382)
Net Income (Loss) Attributable to Parent	(913)	(999)	(6,223)	2,601
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(9,146)	(16,331)	(13,871)	(25,954)
Total comprehensive income	(10,059)	(17,330)	(20,094)	(23,353)
Capital expenditures			15,452	14,302
Reimbursement Revenue		0
Proceeds from sale of assets			178	78
Payments to Acquire Businesses, Net of Cash Acquired			(6,000)	77,962
Net cash used in investing activities			(21,274)	(92,186)
Eliminations
Consolidating Financial Statements, Captions
Current portion of long-term debt	0		0		0
Trade and other receivables, net	0		0		0
Inventories	0		0		0
Accounts payable	0		0		0
Rotable assets	0		0		0
Net sales	(15,752)	(7,877)	(44,556)	(16,119)
Operating costs and expenses:
Adjustments to reconcile net income to net cash (used in) provided by operating activities			5,722	13,134
Net cash (used in) provided by operating activities			(5,722)	13,134
Net increase in revolving credit facility			0	0
Proceeds on issuance of debt			0	0
Retirements and repayments of debt			0	0
Payment of deferred financing costs			0	0
Dividends paid			0	0
Repayments of government grant			0	0
Repurchase of restricted shares for minimum tax obligation			0	0
Proceeds from exercise of stock options, including excess tax benefit				0
Intercompany financing and advances			(5,722)	(13,134)
Net cash (used in) provided by financing activities			(5,722)	(13,134)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net change in cash and cash equivalents			0	0
Cash at beginning of period			0	0
Cash at end of period	0	0	0	0
Cost of Goods and Services Sold	(15,752)	(7,877)	(44,556)	(16,119)
Selling, General and Administrative Expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Asset Impairment Charges	0
Gain (Loss) Related to Litigation Settlement	0		0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			0
Total operating costs and expenses	(15,752)	(7,877)	(44,556)	(16,119)
Income Tax Expense (Benefit)	0	0	0	0
Accrued expenses	0		0		0
Prepaid and other current assets	0		0		0
Total current assets	0		0		0
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	(4,197,256)		(4,197,256)		(4,207,495)
Total assets	(4,197,256)		(4,197,256)		(4,207,495)
Current liabilities:
Total current liabilities	0		0		0
Long-term debt, less current portion	0		0		0
Intercompany debt	(2,966,567)		(2,966,567)		(2,896,811)
Accrued pension and other postretirement benefits, noncurrent	0		0		0
Deferred income taxes and other	0		0		0
Total stockholders' equity	(1,230,689)		(1,230,689)		(1,310,684)
Total liabilities and stockholders’ equity	(4,197,256)		(4,197,256)		$ (4,207,495)
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
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
Capital expenditures			0	0
Reimbursement Revenue		$ 0
Proceeds from sale of assets			0	0
Payments to Acquire Businesses, Net of Cash Acquired			0	0
Net cash used in investing activities			0	0
Pension Plan [Member]
Operating costs and expenses:
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			$ 2,863	$ 0