Trade Receivables Securitization (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Sep. 29, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Schedule of trade receivable securitization [Line Items]
Percent of receivables sold to unaffiliated institutions		100.00%
Company's accounts receivable sold to third-party		$ 1,100,000,000	$ 1,000,000,000
Cash proceeds from sale of accounts receivable		556,800,000	545,000,000
Deferred purchase price receivable		514,895,000	459,994,000	135,401,000
Eligible trade receivable for the purpose of sale, percent	100.00%
Cash flows from new transfers of receivables		600,000,000	600,000,000	1,000,000,000
Receivables sold but not yet collected from banking institutions		110,500,000	109,700,000
Accounts receivable sold to certain third party banking institutions		2,000,000,000	2,500,000,000	1,200,000,000
Cash proceeds from the sale of accounts receivables		4,700,000,000	2,400,000,000	2,800,000,000
Recognized loss on sale of the related receivables and recorded in interest and other expense, net		10,900,000	8,000,000	7,800,000
North American Program [Member]
Schedule of trade receivable securitization [Line Items]
Investment limits with financial institution		300,000,000
Global Program [Member]
Schedule of trade receivable securitization [Line Items]
Investment limits with financial institution		500,000,000
Accounts receivable sold to commercial paper conduit				$ 217,100,000
Minimum [Member]
Schedule of trade receivable securitization [Line Items]
Service fee received, percent		0.50%
Maximum [Member]
Schedule of trade receivable securitization [Line Items]
Service fee received, percent		1.00%