Consecutive Trading Days Under Conversion Trigger.

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Convertible Note Hedge Strike Price

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Cost of hedge net of proceeds from warrants.

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Financing Arrangement [Line Items]

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Shares Covered By Convertible Note Hedge

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Trading Days Of Greater Than Or Equal To One Hundred Thirty Percent Of Initial Conversion Price.

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The exercise price of each class of warrants or rights outstanding.

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The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The price per share of the conversion feature embedded in the debt instrument.

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The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

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-Glossary Conversion Rate

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Remaining amortization period for any discount on the liability component of convertible debt which may be settled in cash upon conversion.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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Financing Arrangement (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified					0 Months Ended		0 Months Ended				3 Months Ended	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2011 Liability Component [Member] 0.75% Convertible Senior Notes [Member]	Jul. 20, 2011 Liability Component [Member] 0.75% Convertible Senior Notes [Member]	Sep. 30, 2011 Equity Component [Member] 0.75% Convertible Senior Notes [Member]	Jul. 20, 2011 Convertible Note Hedge [Member]	Jul. 14, 2011 Convertible Note Hedge [Member]	Jul. 20, 2011 Warrants [Member]	Sep. 30, 2011 Warrants [Member]	Jul. 14, 2011 Warrants [Member]	Jul. 14, 2010 Warrants [Member]	Sep. 30, 2011 0.75% Convertible Senior Notes [Member] years	Sep. 30, 2011 0.75% Convertible Senior Notes [Member] days years	Jul. 20, 2011 0.75% Convertible Senior Notes [Member]
Financing Arrangement [Line Items]
0.75% Convertible Senior Notes due 2016 maturity date											Jul. 15, 2016
Convertible Senior Notes, Carrying Value	$ 529,000,000		$ 525,000,000
Debt issuance costs		13,000,000		2,000,000							15,000,000	15,000,000
Conversion rate of Notes												31.5075
Principal amount	(633,000,000)												632,500,000
Face amount of Notes											1,000	1,000
Initial conversion price per share of Notes											$ 31.74	$ 31.74
Number of trading days greater than or equal to the initial conversion price												20
Consecutive trading days under conversion trigger												30
Effective interest rate											4.54%	4.54%
Strike price for convertible note hedge						31.74
Amount paid for Convertible Note Hedge					107,000,000
Shares covered by Hedge Transactions						19.9
Proceeds from Warrants transaction							$ 65,000,000
Shares covered by warrants issuance										19.9
Strike price of warrants								$ 41.14	$ 41.14
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%										0.75%	0.75%
Debt instrument remaining discount amortization period (in years)											4.8	4.8