CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 6,944,827	$ 6,751,552	$ 20,079,387	$ 19,030,244
Cost of sales	6,527,067	6,305,224	18,852,395	17,775,678
Cost of sales, restructuring charges	60,435	0	89,512	7,981
Gross profit	357,325	446,328	1,137,480	1,246,585
Selling, general and administrative expenses	237,556	247,365	722,608	772,325
Intangible amortization	20,308	19,588	57,059	55,865
Selling, general and administrative, restructuring charges	5,408	0	10,921	0
Interest and other, net	54,087	31,350	136,889	85,780
Other income, net	71,879	6,865	(8,515)	(172,467)
Income before income taxes	(31,913)	141,160	218,518	505,082
Provision for income taxes	13,256	22,827	60,767	56,953
Net income	$ (45,169)	$ 118,333	$ 157,751	$ 448,129
Earnings per share:
Basic (in dollars per share)	$ (0.09)	$ 0.22	$ 0.30	$ 0.85
Diluted (in dollars per share)	$ (0.09)	$ 0.22	$ 0.30	$ 0.84
Weighted-average shares used in computing per share amounts:
Basic (in shares)	524,876	528,405	528,528	529,984
Diluted (in shares)	524,876	534,352	532,308	535,972