Fair Value Measurements (Details Textual) (USD $)	9 Months Ended
Dec. 29, 2012	Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 3,179,861,000	$ 3,063,038,000
Weighted Average Life For Cash Flow Projected On Fair Value Of Student Loan Auction Rate Securities	8 years
Hypothetical increase or decrease percentage of the weighted average life assumption	20.00%
Hypothetical change in percentage input to valuation model of level 3 assets	1.00%
Debt Instruments [Abstract]
Interest rate of debentures	3.125%
3.125% Junior Convertible Debentures [Member]
Debt Instruments [Abstract]
Principal amount of convertible debentures	689,635,000	689,635,000
Interest rate of debentures	3.125%
Fair value of debentures	872,400,000
2.625% Senior Convertible Debentures [Member]
Debt Instruments [Abstract]
Principal amount of convertible debentures	600,000,000	600,000,000
Interest rate of debentures	2.625%
Fair value of debentures	811,500,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Rate On Fair Value Of Student Loan Auction Rate Securities Range	2.59%
Student loan auction rate securities maturity date	12/31/2027
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Rate On Fair Value Of Student Loan Auction Rate Securities Range	3.33%
Student loan auction rate securities maturity date	5/31/2046
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 28,401,000	$ 28,929,000

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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