Fair Value Of Financial Assets And Liabilities (Carrying Value And Fair Value Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	$ 2,105,120	$ 2,607,818
Total Debt, Carrying Value	2,548,329	2,607,818
Trade receivables securitization [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	295,000	295,000
Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	0
Other long-term debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	1,175	2,475
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	2,534,836	2,670,949
Estimate of Fair Value, Fair Value Disclosure [Member] | Trade receivables securitization [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	295,000	295,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Credit Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	60,276	44,077
Estimate of Fair Value, Fair Value Disclosure [Member] | 2.85% Senior Notes Maturing October 2013 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	0	303,413
Estimate of Fair Value, Fair Value Disclosure [Member] | 4.5% Senior Notes Maturing September 2014 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	411,617	421,582
Estimate of Fair Value, Fair Value Disclosure [Member] | 3.25% Senior Notes Due October 2015 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	259,165	263,702
Estimate of Fair Value, Fair Value Disclosure [Member] | 2.95% Senior Notes Maturing June 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	258,721	262,954
Estimate of Fair Value, Fair Value Disclosure [Member] | 1.65% Senior Notes Maturing February 2018 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	317,975	325,401
Estimate of Fair Value, Fair Value Disclosure [Member] | 2.375% Senior Notes Maturing February 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	260,499	274,432
Estimate of Fair Value, Fair Value Disclosure [Member] | 2.90% Senior Notes Maturing November 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	227,102	248,404
Estimate of Fair Value, Fair Value Disclosure [Member] | Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	0	229,381
Estimate of Fair Value, Fair Value Disclosure [Member] | Other long-term debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	1,272	2,603
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Debt	443,209	0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Debt, Carrying Value	2,548,329	2,607,818
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Trade receivables securitization [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	295,000	295,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Credit Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	60,276	44,077
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 2.85% Senior Notes Maturing October 2013 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	0	302,466
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 4.5% Senior Notes Maturing September 2014 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	399,928	399,856
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 3.25% Senior Notes Due October 2015 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	249,868	249,811
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 2.95% Senior Notes Maturing June 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	249,831	249,778
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 1.65% Senior Notes Maturing February 2018 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	324,552	324,471
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 2.375% Senior Notes Maturing February 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	274,738	274,706
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 2.90% Senior Notes Maturing November 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	249,752	249,732
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	0	215,446
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other long-term debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	1,175	2,475
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial Paper, Carrying Value	$ 443,209	$ 0