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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Jan. 26, 2013	Apr. 28, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized loss on marketable securities arising during the period, tax	$ 0	$ 0
Reclassification adjustment for gain on marketable securities included in net income, tax	0	0.2
Change in fair value of cash flow hedge, tax	0.1
Net pension amortization and net actuarial loss, tax		7.5
Net pension amortization	$ 0.9

X

- Definition

Tax effect amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss).

+ References

No definition available.

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X

- Definition

Tax effect, before reclassifications, of the change in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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- Definition

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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