Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 31, 2015	Jan. 25, 2014	Jan. 31, 2015	Jan. 25, 2014
Income Taxes [Line Items]
Income taxes	$ 73,801us-gaap_IncomeTaxExpenseBenefit	$ 47,725us-gaap_IncomeTaxExpenseBenefit	$ 76,372us-gaap_IncomeTaxExpenseBenefit	$ 64,453us-gaap_IncomeTaxExpenseBenefit
Income (loss) before taxes	145,969	110,955	132,389	53,889
Effective income tax rate	50.60%	43.00%	57.70%	119.60%
Operating losses impact on income tax provisions	149,521us-gaap_OperatingIncomeLoss	118,716us-gaap_OperatingIncomeLoss	147,163us-gaap_OperatingIncomeLoss	76,757us-gaap_OperatingIncomeLoss
Valuation allowance	5,972		5,972
Joint Venture Partner
Income Taxes [Line Items]
Operating losses impact on income tax provisions	$ (63,042)		$ (105,542)

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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