SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Condensed consolidating statements of operations
Net sales	$ 6,763,177	$ 7,025,054	$ 18,646,187	$ 20,196,316
Cost of sales	6,310,710	6,616,397	17,444,463	19,029,793
Gross profit	452,467	408,657	1,201,724	1,166,523
Selling, general and administrative expenses	240,617	215,993	666,798	629,860
Intangible amortization	19,319	8,045	43,117	23,228
Interest and other, net	65,981	14,102	106,363	(1,348)
Income before income taxes	126,550	170,517	385,446	514,783
Provision for (benefit from) income taxes	(22,360)	17,618	2,709	49,094
Equity in earnings in subsidiaries	0	0	0	0
Net income	148,910	152,899	382,737	465,689
Reportable legal entities | Parent
Condensed consolidating statements of operations
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Intangible amortization	75	75	225	225
Interest and other, net	49,358	27,876	(347,663)	(24,933)
Income before income taxes	(49,433)	(27,951)	347,438	24,708
Provision for (benefit from) income taxes	0	0	0	0
Equity in earnings in subsidiaries	198,343	180,850	35,299	440,981
Net income	148,910	152,899	382,737	465,689
Reportable legal entities | Guarantor Subsidiaries
Condensed consolidating statements of operations
Net sales	4,598,248	5,164,527	13,126,846	14,702,071
Cost of sales	4,186,909	4,757,332	11,972,222	13,616,471
Gross profit	411,339	407,195	1,154,624	1,085,600
Selling, general and administrative expenses	83,750	64,161	214,015	188,788
Intangible amortization	960	937	2,881	2,624
Interest and other, net	318,367	249,948	931,754	797,142
Income before income taxes	8,262	92,149	5,974	97,046
Provision for (benefit from) income taxes	(8,071)	(5,737)	(4,630)	9,053
Equity in earnings in subsidiaries	(52,808)	(69,438)	(104,435)	(55,992)
Net income	(36,475)	28,448	(93,831)	32,001
Reportable legal entities | Non-Guarantor Subsidiaries
Condensed consolidating statements of operations
Net sales	5,717,609	5,437,970	15,167,659	15,399,047
Cost of sales	5,676,481	5,436,508	15,120,559	15,318,124
Gross profit	41,128	1,462	47,100	80,923
Selling, general and administrative expenses	156,867	151,832	452,783	441,072
Intangible amortization	18,284	7,033	40,011	20,379
Interest and other, net	(301,744)	(263,722)	(477,728)	(773,557)
Income before income taxes	167,721	106,319	32,034	393,029
Provision for (benefit from) income taxes	(14,289)	23,355	7,339	40,041
Equity in earnings in subsidiaries	(12,229)	61,337	40,531	148,946
Net income	169,781	144,301	65,226	501,934
Eliminations
Condensed consolidating statements of operations
Net sales	(3,552,680)	(3,577,443)	(9,648,318)	(9,904,802)
Cost of sales	(3,552,680)	(3,577,443)	(9,648,318)	(9,904,802)
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Intangible amortization	0	0	0	0
Interest and other, net	0	0	0	0
Income before income taxes	0	0	0	0
Provision for (benefit from) income taxes	0	0	0	0
Equity in earnings in subsidiaries	(133,306)	(172,749)	28,605	(533,935)
Net income	$ (133,306)	$ (172,749)	$ 28,605	$ (533,935)