CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
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	21,566	9,035	60,106	40,178
Other charges (income), net	44,415	5,067	46,257	(41,526)
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
Net income	$ 148,910	$ 152,899	$ 382,737	$ 465,689
Earnings per share
Basic (in dollars per share)	$ 0.27	$ 0.26	$ 0.68	$ 0.80
Diluted (in dollars per share)	$ 0.27	$ 0.26	$ 0.67	$ 0.78
Weighted-average shares used in computing per share amounts:
Basic (in shares)	554,919	577,157	561,070	583,383
Diluted (in shares)	560,996	587,201	568,926	594,791