Fair Value Measurements (Details Textual) (USD $)	12 Months Ended
Mar. 30, 2013	Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Noncurrent	$ 1,651,033,000	$ 1,209,228,000
Available-for-sale Securities	3,289,221,000	3,063,038,000
Weighted average life over which cash flows are projected for 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]
Stated Interest rate of debentures	3.125%
3.125% Junior Convertible Debentures [Member]
Debt Instruments [Abstract]
Stated Interest rate of debentures	3.125%
Fair value of debentures	918,900,000
2.625% Senior Convertible Debentures [Member]
Debt Instruments [Abstract]
Stated Interest rate of debentures	2.625%
Fair value of debentures	854,000,000
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	2.44%
Student loan auction rate securities, maturity date	2027-12
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	3.16%
Student loan auction rate securities, maturity date	2046-05
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Noncurrent	$ 28,700,000	$ 28,929,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Interest rate stated in the contractual debt agreement.

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Student loan auction rate securities maturity date.

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