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Stockholders' Equity - Reconciliation of Retained Earnings (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Retained Earnings Adjustments [Line Items]
Beginning balance			$ 1.1us-gaap_RetainedEarningsAccumulatedDeficit
Net income	176.8us-gaap_NetIncomeLoss	192.1us-gaap_NetIncomeLoss	425.0us-gaap_NetIncomeLoss	440.5us-gaap_NetIncomeLoss
Repurchases of common stock			(251.5)us-gaap_StockRepurchasedDuringPeriodValue
Dividends paid			(156.9)us-gaap_PaymentsOfDividends	(153.1)us-gaap_PaymentsOfDividends
Ending balance	69.8us-gaap_RetainedEarningsAccumulatedDeficit		69.8us-gaap_RetainedEarningsAccumulatedDeficit
Retained Earnings
Retained Earnings Adjustments [Line Items]
Dividends paid			$ (104.8)us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (102.7)us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6519514



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

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

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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