Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Apr. 28, 2012
Quoted Prices in Active Markets for Identical Assets or Liabilities Level 1
ASSETS
Money market funds	$ (471,359)
LIABILITIES
Derivative liabilities	0
Significant Other Observable Inputs Level 2
ASSETS
Money market funds	0
LIABILITIES
Derivative liabilities	52,029
Unobservable Inputs Level 3
ASSETS
Money market funds	0
LIABILITIES
Derivative liabilities	$ 0

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

+ References+ Details

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details