Bank Borrowings and Long-Term Debt (Revolving Credit Facilities and Other Credit Lines) (Details) (USD $)	0 Months Ended				12 Months Ended			1 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended
	Feb. 17, 2011	Sep. 28, 2010	Sep. 27, 2010	May 10, 2007	Mar. 31, 2011	Mar. 31, 2010	Oct. 01, 2007	Aug. 31, 2010 1% Convertible Subordinated Notes [Member]	Mar. 19, 2010 6.5% Senior Subordinated Notes [Member]	Jun. 30, 2009 6.5% Senior Subordinated Notes [Member]	Mar. 31, 2010 6.5% Senior Subordinated Notes [Member]	Dec. 31, 2010 6.25% Senior Subordinated Notes [Member]	Jun. 30, 2009 6.25% Senior Subordinated Notes [Member]	Mar. 31, 2011 6.25% Senior Subordinated Notes [Member]	Mar. 31, 2010 6.25% Senior Subordinated Notes [Member]	Mar. 31, 2011 Term Loan Agreement [Member]
Credit facility, expiration date	February 17, 2014	September 28, 2013	September 27, 2013	May 2012
Credit facility, amount outstanding					$ 160,000,000	$ 0	$ 1,109,000,000									$ 1,700,000,000
Uncommitted revolving credit facilities, lines of credit and other loans					321,600,000
Borrowings outstanding					1,600,000	6,700,000
Amount paid for redemption of convertible subordinated notes								240,000,000	306,300,000	101,800,000		308,500,000	101,300,000
Conversion price of convertible subordinated notes								$ 15.525
Aggregate principal balance of convertible subordinated notes redeemed									299,800,000	99,800,000		302,200,000	99,900,000
Redemption price as a percentage of principal amount									102.167%			102.083%
Loss associated with redemption of notes									(10,500,000)	2,300,000		13,200,000	2,300,000	13,200,000
Consent fees paid													6,500,000
Redemption price premium					6,300,000				6,500,000					6,300,000
Write off of unamortized debt issuance cost										$ 2,600,000	$ 4,000,000			$ 6,900,000	$ 2,700,000