CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 6,114,999	$ 6,763,177	$ 18,000,337	$ 18,646,187
Cost of sales	5,698,544	6,310,710	16,864,196	17,444,463
Gross profit	416,455	452,467	1,136,141	1,201,724
Selling, general and administrative expenses	231,551	240,617	715,040	666,798
Intangible amortization	18,734	19,319	62,318	43,117
Interest and other, net	22,838	21,566	71,869	60,106
Other charges, net	3,090	44,415	15,007	46,257
Income before income taxes	140,242	126,550	271,907	385,446
Provision for (benefit from) income taxes	10,773	(22,360)	39,217	2,709
Net income	$ 129,469	$ 148,910	$ 232,690	$ 382,737
Earnings per share
Basic (in dollars per share)	$ 0.24	$ 0.27	$ 0.43	$ 0.68
Diluted (in dollars per share)	$ 0.24	$ 0.27	$ 0.42	$ 0.67
Weighted-average shares used in computing per share amounts:
Basic (in shares)	539,638	554,919	542,780	561,070
Diluted (in shares)	545,022	560,996	548,372	568,926