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Stockholders' Equity - Income Tax Effects Associated with Employee Stock Transactions (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Income tax benefit associated with employee stock transactions	$ 54.0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	$ 22.5us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet

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- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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- Details

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